iv got 35 hours not 48 for free?

[TheDoofWarrior]

Accumulated playing time:
0 weeks, 0 days, 08 hours, 48 minutes, 33 seconds
Account status:
Free account with 25:43:48 Play Time remaining.

should the account start with 48 hours meaning i should have around 39 or so hours (to lazy to math) but im still confused buy this freemium malarchy