How many minutes does a Citizen interview last...

[happynewyear]

1. How many minutes is the interview for Citizenship?

2. Also if one goes with spouse, are both interviewed separately?

3. Does one have to carry tax returns, birth certificates etc.? They haven't asked for any of these in the interview letter.

[immihelp]

1. Around 15 minutes.
2. Separately.
3. Not needed. But better to carry as God knows what question will arise during the interview.