T+1 settlements
The standard settlement for an executed stock or options trade in your Robinhood investing account is the next business day after the trade (T+1).
Business days are Monday through Friday except for US Stock market closures and half-days.
If you place a trade on a Tuesday, the transaction will settle on Wednesday.
You can use trade proceeds for cash withdrawals after 1 business day (T+1). When using a non-margin account, the sell proceeds are available after 1 business day to buy securities. In a margin account—the default setting when opening a Robinhood UK account—the funds are available immediately to buy securities after a sell trade is executed.