Hilton indeed is quick. While the line entry has not in account yet but the amount is included in the balance.

And yes, the best option on Hilton is the $75 level. I did not know there is no limitation on Hilton redemption. Will clear out the account tomorrow given I dont want to chance Hilton's IT glitch in late night.

So now we know UA is instant. Hilton is almost instant.

Still no show on AA, AS and BA. Will update on the timeline.