Before she was born, both Prophet Muhammad (PBUH&HP) and lady Khadija (AS) went to a spiritual retreat separately for forty days by the command of Allah.  During those days, Prophet Muhammad (PBUH&HP) and Lady Khadija (AS) prayed Allah sincerely and prepared their pure soul to receive Allah's blessing, their beloved daughter. After those forty days of worship and servitude, angels brought Prophet Muhammad (PBUH&HP) an apple from heaven, and he broke his fast with those gifts from Allah. That night Lady Fatima (AS) was formed [1].

The father-daughter relationship between Prophet Muhammad (PBUH&HP) and Lady Fatima (AS) was one of a kind. Here, we are going to exemplify some instances of deep father-daughter love between the two and the formation of an ideal respectful relationship. 

1. Respecting and Loving Lady Fatima (AS) 

Prophet Muhammad (PBUH&HP) was always affectionate and caring toward Lady Fatima (AS). He used to kiss her throat every time she returned from a trip [2]. In response, she used to hug her dear father and kiss his forehead, between his eyes [3]. He didn't get to sleep before kissing her cheeks and praying for her, which reveal his deep respect and fatherly love toward her [4].  Aisha said she was the most similar person to Muhammad (PBUH&HP) in her speech. Whenever she came to see Prophet Muhammad (PBUH&HP), he used to take her hand and kiss her and sat next to her, and whenever Prophet Muhammad (PBUH&HP) went to meet Fatima (AS), she used to kiss his hand and sat next to him respectfully [5].

2. Lady Fatima (AS), The Mother of Her Father (Umme Abiha) 

Lady Fatima (AS) lost her mother when she was five. The other five years of her life passed without a mother. As a daughter, she used to take care of her father. Whenever the unbelievers threw him stones and ashes, Fatima (AS) used to take care of him and do what a mother does for her child. That is why when Allah asked Prophet Muhammad (PBUH&HP) to call his wives Umol-Mumenin (Mother of the Believers), she asked him to grant her a title, too, Then Prophet Muhammad (PBUH&HP) called her Umme Abiha, the mother of her father [6]. 

3.The Event of the Cloak

Prophet Muhammad (PBUH&HP) was at home, resting, with his cloak over his body. Fatima (AS) came beside him with some food. Prophet Muhammad (PBUH&HP) asked her to call her husband, Ali (AS), and her two sons, Hassan (AS) and Hussain (AS). They started eating together when Allah inspired this verse to his Prophet: 

"Stay in your houses and do not flaunt your finery like the former [days of pagan] ignorance. Maintain the prayer and pay the zakat, and obey Allah and His Apostle. Indeed, Allah desires to repel all impurity from you, O People of the Household, and purify you with a thorough purification." Quran (33:33)

Then Prophet Muhammad (PBUH&HP) covered the four of them with the remaining of his cloak and prayed:

O Allah, these are the people of my household and my special ones. Keep them pure and clean and take all evil away from them [7]. 

4. Attached, Even in the Other World

Prophet Muhammad (PBUH&HP) used to know about the difficulty of Lady Fatima's (AS) life after his death and the cruelty imposed on her and her family, and he cried for that a lot. Once when she was crying, he inspired her with this news: "You will join me in the other world soon after" [8] Lady Fatima (AS) was martyred 95 days after the death of his father!

References:

1. Naseri, Muhammad (2011), Prophet Muhammad's Behavior with Fatima, Farhang-e Kothar, vol. 81. 
2.  Bihar al-Invar, Vol.43, p. 6.
3.  ibid, p 40.
4.  ibid, p 42.
5.  Amini, Ibrahim The Model Woman of Islam, Fatima Pp108-109.
6.  Qa'emi, Ali In Fatima's School p.90.
7. Tabatabai, Muhammad Hussain, Tafsir Al-Mizan Vol. 16, P 474
8.  Qomi, Abbas, Montahal Aamal p164.

The hours of fasting in Ramadan vary based on the geographical position of the city where one lives. In some regions, the fasting hours might be extremely long while in other places it might be too short such that one wonders if the goal of fasting (Sawm) has been accomplished or not. Extended fasting might cause difficulties.

Some might complain that there is no advantage in fasting long days. Others might find excuses to avoid fasting altogether. But, Islam does not want Muslims to suffer. There are, therefore, some rulings on how to fast on very long days and very short days, that we review them all next.

Fasting in Ramadan on Extremely Short Days

In the case where the days are very short, one should perform fasting in its typical way, from dawn to sunset, according to the prayer times. Hence, short fasting hours does not change the default time rulings on fasting (Swam) [1].   

Fasting Is Not to Suffer

Fasting is not a mere act of depriving oneself of foods or drinks, but it aims at spiritual growth and salvation, inner peace, exercising patience, strengthening the social ties and experiencing how poor people live their lives [2].

Hence, the obligation on fasting is not to make people suffer; as it is stated in Surah Baqarah: “Allah intends for you ease and does not intend for you hardship” (2:185). So, there are some rulings on long fasts which make them less difficult.

Fasting in Ramadan on Very Long Days

Long fast (Swam), especially in hot summer days, is tough. In this case, one should fast according to the prayer times of his\her city of residence. But, if it is extremely difficult, whenever during the day he\she feels unable to continue, he\she is allowed to break the fast (Swam) and have to fast (it is obligatory, Wajib) later on for those missing (Qaza) fasts in shorter days of the current year and before the next Ramadan [1]

However, different religious experts (Mujtahids)  have different opinions on this matter. We explained one of those views above. There are two other opinions as follows and one of them might be the opinion of your religious expert (Mujtahid):

 In any case, one should fast according to the prayer times of the city of residence;
One should fast according to the prayer times in a “moderate region,” with the normal day length, that is on the same meridian as his\her city of residence.

Conclusion

Fasting is obligatory due to its spiritual and physical benefits. It is not to put pressure and make people suffer. If it is tough to fast in very long days, one can fast according to the rulings stated above. 

References:

1. Fasting in different country