I use a 65k propane cooker, and it's massively faster than my stovetop - though I use that on occasion as well for full-scale batches.
My typical brewday involves putting water on to heat, and it's ready to mash-in by the time I've weighed and milled my grain. 10-15 minutes after mash-in, I'll start heating sparge water, and once it's at 175 or so, I'll mash out - with the 10-15 minute delay, that gives me a ~40 minute mash. (If I'm mashing really low, I'll extend the mash time).
Anyway, with the propane burner, I can crank out an all-grain batch in 3.5 hours. Stovetop takes nearly double that time.