No need to experiment, just do the math. It displays how much you will get when you select time. And multiplying by 6 is rather easy.
1 day is much better than 4 hours because you get same amount of stats but there is less downtime unless you can login right after each 4 hour period expires. So there is no reason to choose lower timer unless you know that you won't be able to login at certain time and need to use lower timer to be able to restart it earlier.