policy for lining up for GA in boston

hi! i have a GA pit ticket for the show in boston and i was wondering if anyone knew fenways policies on lining up early? does the venue have a certain time that you can stay lining up? also, i know that some venues will give you a number when you line up and you’re able to just leave and come back for doors and get the same spot, does anyone know if fenway does this? thank you!