10 minutes? To find the position, see if you fit, customize your cover letter and resume to well fit, and go through their portal? I could see maybe with aid of a GPT this being possible nowadays but still non-trivial.
I generally change jobs every 2 years for the last 15 years. I have never used a cover letter. Your mileage may vary but I think they are generally ignored.
I can't think of a position I applied for that I didn't spend at least an hour working on the initial application. And an hour would be fast-tracking it.