Boil time for starter?

I know about the picture with 1/2cup DME + water + 10mins, but I was wondering: if I boil for fewer than 10mins will there be any down side?

I have an electric tea kettle, and it will boil 1L water + 1/2cup DME w/ fermcap for ~5-6min without boiling over but by 8 mins or so it is just too hot and won't stop boiling over, even if I take if off the heat and let the bubbles die down. 1L is the minimum volume of the kettle for safe use, so using less water isn't an option.

10 minutes should be plenty. Some people like to boil longer to separate out the break material, but I'm not sure there's any benefit to that.

I probably boil for three minutes.

Word. The shorter period of time that malt-volcano is on top my stove, the better!
;-)