People keep talking about the dose amount but never the ROA. If 40mg orally feels good and lasts me 6hours and I dont want to end the night yet, how much should I re-dose and once the re-dose hits me, am I expecting it to last less then another 6hours or more? Usually I sleep at festivals every night for 8-10hours which annoys me and is the main reason why I am trialing meth at a festival, so I can stay awake and dont miss any of the action (which i always regret as I have no control over how much i sleep asoon as i fall asleep). So I only plan on taking meth over 1 night and maybe during the course of the day. (24hour total)
Also, I plan on taking LSD at the festival, most likely during saturday morning, then when the LSD has worn off take methamphetamine through the night until morning sunday. On sunday morning, will i be too scattered to take LSD again? Even if I sleep for 4-6hours?
From what I've learnt through trialing.. Meth before LSD is amazing. Taking LSD while already in a crystal clear headspace boosts the trip.. In saying that, as above, don't dose meth too close after your trip.. I've found smoking pipes while my acid is peaking is very uncomfortable and a little too much to deal with.
Depending on when you're taking the acid maybe help yourself rest again before dosing meth if needed and ride out the rest of the festival with meth. Also there's a good chance if you rest from LSD then dose it again the next day it wont have as much (of a pleasant/psychedelic) effect until the 2 or 3 days following..
As for meth dose, 40mg orally wouldn't be enough to start with but that's speaking from a decent tolerance, although I'm thinking back to when I first started taking it.. I smoke and if it's good gear, 50-100mg max should knock you back breathless for a tick then you're good to party.. Then another half a point or a point little while after..
A gram would last me and a friend or two that whole 3-day time, but if you're low/no tolerance you would have leftover

100mg orally (if that's your preferred ROA) at a time, spaced 3-6 hours apart would do the trick.. Just go with how you're feeling and remember oral dosing meth takes 20 minutes to give the high and it's a different kind of rush to smoking which is immediate. I haven't eaten meth in a long while, maybe ever come to think of it as smoked meth is my DOC and I found what works for me.. So you should find what works for you

a gram will give you enough leeway to find that out exactly

eat a bit, snort a bit maybe, even smoke if you are into it and have the tools/know-how.. Find your sweet spot and when you get the rushes you hoped for - give it a rest for a while, ride out the high and make use of it til you feel like prolonging it
I hope your product is good quality too, and hope that helps in any way.