I would agree to leave it a minimum of 24 hours - preferably longer - to avoid any potential problems. The other potential issue I could see would be if you dose 'shroomies whilst you are in withdrawal from trams - that would probably also be a Bad Idea. If you get tram withdrawals when you go without them for a day or so I'd look into getting yourself a lowish dose of some other opiate (maybe codeine or something of that ilk) to keep the wolf from the door whilst in Mushland. And have a good trip