UPDATE 6/29
Heat seems to have stabilized here on day 4, I looked at some charts and the buildup "peak" is on day 5 aka tomorrow, and after that there are very small increase in the buildup aka wont be noticeable after day 5.
I had to do a LOT of work at home today, very critical stuff taking a lot of mental energy, but after that I needed to make a run to the store. Now, its only 7 min walk away, but it was 90F today and honestly I was worried about overheating once I got to the store as its never cold in that shitty ass marketplace i go to and no fans.
however my heat was stable around a 8/10 range with my shirt off and low amounts of brief direct sun exposure where there wasnt any shade to walk in. But I was wearing flip fops, shorts, and no shirt. With regular non athletic clothes, Id easily overheat within 5 mins. But luckily I get to do what I want , no girlfriend so never have to dress up etc so its all working out.
I would recommend people with a similar lifestyle aka focused on their goal, good control of where they wanna be and what they are doing all day with no commitments, then 400mg is not too bad and very moderate, you dont walk around burning up 24/7 , it really comes in pulses through the day depending on how active you are. But you always always always want some sort of cooling method on hand, whether it be cold icewater, a box fan, air conditioner etc.....
I DO NOT RECOMMEND YOU TO PUSH LIKE I DID AND WALK TO THE STORE IN THE PEAK OF SUMMER WITH NOTHING BUT YOUR OWN SWEAT TO COOL YOU. IF THERE IS NO WIND TO COOL DOWN THE SWEAT, YOU WILL NOT BE "STABLE" AND WILL HAVE A CERTAIN AMOUNT OF TIME BEFORE YOUR TEMP STARTS TO GET TOO HIGH! THIS HAPPENED TO ME ON A DIFF OCCASION ON DAY 3 AFTER PUSHING MYSELF TOO HARD. ITS NO JOKE. I WAS CARRYING SOMETHING OUTSIDE TALKING TO MY FRIEND ON THIS HOT ASS HUMID DAY AND OUT OF NOWHERE NOTICED I WAS OVERHEATING AND RUSHED IN THE HOUSE TO MY FAN AND WAS FINE. THOSE ARE THE MOMENTS YOU NEED A COOLING STATION OR YOUR GONNA GET FUCKED UP.
. BUT if you plan to live like a normal person and wear any clothes/shoes/socks that arent athletic and breathable, expect to immediately slowly begin building heat up until you take the clothes off or get a fan to air you out. I would not recommend messing with over 200mg if you have any sort of professional job in a office. If you are a freak like me and can modify your life around the dose, then YES I would absolutely go with 400mg. I would wager 600mg would even be decently tolerable by me but dont have the balls to do it.