Sorry i have no idea, it doesn't specify how long,
The only additional info i have is this:
Switch on radio The display reads "SAFE" followed by "1000"
Introduce radio code, confirm bt pressing PROG key untill you hear a beep
and the display reads "SAFE" If you get the number wrong
the dispaly continues to read "SAFE" respect the waiting intervals btween attempts.
I know it's not very clear is it, but the handbook doesn't specify how long, presumably you just have to wait till the "2 SAFE" on the display goes away then go throught the sequence again,
Sorry if thats not clear enough blame the bloke who wrote the SEAT handbook...
I know what you mean just phoned seat he say leave radio switched on and lock the doors 2 c if that works
will try that now if no luck going to have to pay