Hello Jackie,
I do both. I prefer to do an over night infusion with room temp
water. However, if I am in a hurry I will pore boiling water over it and wait 1-2 hours. I prefer the overnight with room temp water as it gives me more mucilage which is what I am after. You can coax more mucilage out of the
root with the hot infusion by smashing it before you decant also. Sometimes I just pull the root out and suck on it additionally. After sitting there in the water it is usually soft
enough that I can chew and suck on it to get the mucilage out. Lots of choices.