If you want to work only 34 hours, expect to proportionately get only 85% of your salary. And definitely don't expect others to work Saturdays. Don't contact your coworkers over the weekends either.
It is not linear, unfortunately. For working only 34 hours, expect to get maybe 50% of your 40-hours market salary, if you are lucky. Because by standing out from the crowd, you are sending a signal that you are "somehow weird", and that is not a good signal to send.
As long as there are other people willing to work 40 hours a day, most companies won't bother making an exception for someone. Why hire a "weird" person, if there are non-weird alternatives available?