It really depends...
while studying with usual going out (beginning of semester):
2 days x 8 hours & 2 days x 4.5 hours & 3 days x 6 hours = 43 hours
while studying with a bit going out (mid of semester):
2 days x 8 hours & 4 days x 6 hours & 1 day x 4.5 hours = 44.5 hours ( didnt make as much of a difference as I thought

)
before exams (end of semester):
1 day x 8 hours & 6 days x 5 hours = 38 hours
overall: 43 & 44.5 & 38 / 3 = 41.83 hoursPick the one you like the most or take the overall one.
I'm also interested in your results, if you dont mind pming me.
Hope this helps
