For the past 4 weeks, the average weekly payout is 0.05BTC, so ROI is almost 8 weeks.
It will take me approximately 10 weeks to recover my investments due to an increase in bitcoin difficulty, what is the actual life span of this account.
I've had this account for over 4-5 months now, and the hashing is purchased for a years time. Theirs around 6 months left on the account, so not sure about your 'life span' comment.