I would think he should be able to on the weekends, since he will be doing intial training and company paperwork for about 3 weeks. Thus he could leave Friday evening and fly back Sun evening.
This is presuming he is allowed JS from day 1.
It can be done, because I do it.
F9DXER
I cant jump seat until I get thru training. Then im good to go. I can non rev in a matter of about two weeks though.