It's really hard to answer your question as it really depends on what your body can handle.
I usually can manage sessions if they are 6 hours apart or so, but it really depends on your body/age/shape and what you plan on doing those sessions.
I think 24 hours apart should be enough to recover
Posted By: RockyMnt77 Is it a totally bad idea to schedule 2 engagements on sequential nights? I am most definitely not a super-stud so a very rare consideration for me. However, due to my work/travel schedule there are 2 ladies I would REALLY like to see and the only way for that to happen is back to back nights. Any thoughts? Advise from experienced hobbiests out there who have gone this route and how it worked out for them? THANKS!