Posted: Sun Apr 18, 2021 10:47am
Once you have made the appointment with Police National you can cancel it (as long as its not the same day) and start over, that is not a problem. Appointments can be a little challenging to get some days though. Yes it takes 50 days at this time to get your TIE after your appointment.
Also i would not be surprised if the Green residency card is replaced formally by the TIE which would put a sudden rush on appointments again.
I think the bigger issue though is leaving the Country and expecting to be able to get back in without a Green Residency card or the TIE. I also would not risk that unless it was an emergency to leave.