There's no "warm up" time, so it does the job quickly, or take as long as you want. Do yourself a favor, and read the instructions, because the physics will be new to you. Boyle's Law, circa 1665, works automatically to regulate the suction. Scottish physicist Sir Robert Boyle would be pleased that his 350-year-old discovery is being put to good use.
It's pretty cool for the suction and stimulating but maybe a little too stimulation with too many nodules for my liking.