If you havent heard back after 1-2 weeks, look elsewhere
You should always be looking elsewhere until you have a written offer in hand. Even then I’d recommend getting at least another offer. If not just for negotiations, but so you have something to fallback on in case something happens before your start date.
Stay at GS. Shit is hitting the fan at Yelp. All hail Google
Should only be two or three days tops. If you still haven't heard, send the recruiter an email.
How long have you even waited? Just chill and keep interviewing