All phones/devices differ it’s unrealistic and unsafe to put a exact time/temperature needed to soften the adhesive. It’s really quite simple you warm the device evenly and in a controlled manner just enough to enable pry tools and picks to begin separating. Best tool in my opinion but again this is because I have experience is a hot plate and heat gun both of which are used at nearly the lowest settings and I can handle flat palming the plate for almost 10 seconds I leave the device to conduct heat until approx it’s about 110 at most 120 ish this will be plenty to soften all the adhesive if any problem areas I use heat gun while prying. Again you need go slowly and learn with a throw away phone
You can not use anything other then the microwave or boiling method to heat the opener.