For Norbert's Gambit in BMO InvestorLine, can i buy the $CAD stock and sell the $USD stock immediately after? Or do i need to wait in between?

For Norbert's Gambit in BMO InvestorLine, let's say i buy 100 shares of $TD (CA version in $CAD).. Am i able to immediately sell 100 shares of $TD (US version in $USD)? Or do i need to wait (a day or how long?) until the purchase settles before selling? And to do NG, you just buy, and then sell the same number of shares right? Another thing is, after selling into $USD, how long until i can transfer it out of BMO InvestorLine into my BMO USD Chequing account? Same day? Next day?