Yeah, it seems like autoclickers are getting capped at about 19 clicks a second, same as last event. You should be able to pull in somewhere between 550-570 clicks per star.

Assuming 550 per star, that's 146 total needed.

For 24 stars, you should have at least 13200 points.

Pro tip - only cash in one star at a time. Every time you're cashing in a star, you have the opportunity to get bonus stars. So if you cash in them all at once, that's only one 30 second period to get bonus items. If you cash in 20 individually, that's 20 thirty second periods to get bonus items.