I dont know what to compare to really but a few minutes.. It depends.. right now I have a stove that has effect up to nr. 6 .. maximum heat.. Thoose electric stoves can sometimes have effect 12 so thats even mroe awesome.
I just put my coals on there the first thing I do and they are perfectly done the same time I have emptied my last bowl, made the new bowl ready with tobacco, eptied old water and putting new water with ICE ! And it's all done