Robinhood typically calls you back within 30 minutes +𝟏-918-708-1933 after you request a phone call through the app. The exact wait time may +𝟏-918-708-1933 vary depending on the volume of requests.
https://realreview.proboards.com/thread/613/talk-people-robinhood-help-easily
https://realreview.proboards.com/thread/614/connect-support