onboarding is out of round, so its instant. You just provide a taproot address and the ASP virtually allocates a bit of the utxo to your address. If you want to do a unilateral withdrawal you need some btc in your wallet but otherwise it requires no inbound liquidity. 

 🐇🕳️ thank you! 

 say whattt?!?!?  So cool. Thanks for looking into this!