Levels of Jannah (Paradise) are too many according to the good deeds and the sincerity in achieving them. Every good deed has a degree n Paradise according to the level of sincerity of the person in doing it.
We have Hadeeth (The levels of Jannah are like the number of the verses of Quran, that is why, the Momin who recited Quran wil be told in the Paradise, Go up in the degrees of Jannah as much as you recited from Quranic verses.
It is not allowed to break the fast before the start of the night as we read in Quran (ثم أتموا الصيام إلى الليل ) (And complete fasting till night). This is the Quranic order which can never be challenged. This is for all people who have day and night in 24 hours.
It is very simple and easy to calculate Khums. It is just to calculate how much you have remaining cash in hand or bank or with people, and property except your residence, and remaining unused items. You calculate the total and take 20% which is the Khums.
Wassalam
اللهم إجعلني ممن طال عمره وزكا عمله
ALLAHUMMA EJ'ALNI MIMMAN TAAL UMROHU WA ZAKA AMALUH
There are good deeds which increase lifespan like : Being very good to your parents and your relatives.
"Indeed, We have tried them as We tried the companions of the garden, when they swore to cut its fruit in the [early] morning"