How long does it normally take to do a factory reset it’s been going on for over half an hour now.
Welcome to this user forum for BT Retail phone and broadband customers.
You will need to specify which BT device you are trying to factory reset.
None should take longer than a few seconds
Why were you doing a factory reset? Do you have a problem and if so if you explain what it is the forum users may be able to assist you in resolving it.