Heres the thing...
In my church, we have set times for each ward.
So the Thayer park ward goes at 8:30 to 11:30, and the highland ward goes at 11:00 to 2:00.
You are assigned to a ward based on boundaries on where you live.
Also, the times change every year (except for the singles ward, they got it easy).
Like last year I had the 8:30 session, and it was rough.
Now we have the 11:00 session, and it is good.
Also, it depends on what stake you are in, because they all do it in different time sessions.
Anyways...
The lord has said that you should pray every day.
Joshua 1:8
"This book of the law shall not depart out of thy mouth; but thou shalt meditate----therein day and night----, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success."
Also, the same thing is true for attending church, if it is optional when, then choose whatever time is easiest. However, sometimes when you make sacrifices, you get extra blessings. But the main point is that you get to church and say your prayers.