Even better I've had an interview for a company that listed a insane list of skills, spanning front-end to backend over 3 different tech stacks... Turns out your application gets sorted into very specific teams by HR, with a much more limited tech stack. They had a whole online platform for testing before I even spoke to a real human....
Being 'locked' into a limited tech stack wasn't what I was looking for at the time, so all in all a huge waste of time.
20? I've seen 200+