I do 5 gallon batches. I usually start with 7gallons and go from sparge to boil in under 10 minutes. I haven't payed much attention to it since I first got it, but it isn't slow enough that I can ignore it at all. I also brew inside, so my wind/cold conditions are pretty constant and mild.
I also crank it up to full power and start the heating when I start the sparge runoff (basically, once it gets above the coils so I don't dry fire them). That probably cuts down a lot of the time I would have to wait compared to if I just cranked it up when the runoff was done.
For sure though, it is comfortably quick.