Dont be fooled buddy!!!!
Iv my September 03 roster from Qatar Airways here in front of me..... My BLOCK time for the while month is only 58 hours but my DUTY time is 141hours!!!! SO theyre just playing with words!!!! Theres a lot more to the flight then the bit after take off and before landing!!!!
Im with BA now and to be honest.....I dont think iv ever worked so little but still got payed so much!!!!
Try a more experienced company if I were you!
Good luck though, if you do decide to go to Qatar, worst airline but there are a few nice people there and you may just have a ball like I did!