[Anykeylo]

The body is not some dumb animal that will let itself be harmed just because its occupant wants to stay out for too long at a time. As Robert Bruce explains you never fully leave it while you are still alive: you send out a copy and the copy's memories dominate the body-side's memories for the time-frame. When the body truly needs your attention it will keep raising its "voice" until it has your attention again. The only way to avoid this is some kind of drug or poison or injury such as oxygen deprivation, and those would make the quality of the projection experience less than it should be.

Of course, all that is off-topic. I seriously think we are just talking about getting more time out of body within a single afternoon session rather than trying to extend projection into hours, days, or weeks. This is why I suggested lucid dreaming as an alternative; if nothing else, a good nap would be welcome and it could develop into WILDs (wake-induced lucid dreaming).