It’s usually fairly quick (i.e. 2 hours would be the max I’d expect generally), but it could be that there is a rush on, or as it’s your first transfer it’s taking extra verification?
I’ve had an issue twice now when depositing through Monzo (flagged in app support). When taken back to FT it just hit a loading screen both times and no matter how long I left it it didn’t fix itself. The money did come in after a couple of hours, thankfully. May deposit again on payday so I’ll see if 3rd time’s a charm!