What is the average heating time for the sidekick V1 and V2?

A SideKick V1 heats up about 30 seconds faster do to the 7 volts compared to the 3.5 volts in the V2.  But the V2 gets 0-10 uses while the V1 gets about 3 uses per charge.

Average heat up time is about 1-1.5 minutes