100mg is an awful lot. it's been a few years since i took 4-ho-met, but i'm pretty sure i had trips with DMT-like 'entity contact' from doses smaller than that.
have you taken that much before?
be careful, it's not the sort of place you want to end up if you're not a highly experienced tripper
rule of thumb is that if you want to trip two days in a row, is that you double the dose.
i've never actually tried it, but i shudder to think how much acid you'd have to take to get any effect the day after 4-ho-met...
no idea if that's related to your question or not, but as those guys said - a week minimum. i've tripped twice in 5 days, and maybe even 4 - but the longer you leave it, the more profound the trips tend to be, in my experience.