I just bought a set of tickets to visit the cathedral on a Monday at 3:00. I was updating some of my records and then I hit the website which shows the Cathedral closes at 3:30 on Mondays. I tried to email the cathedral but the email address on the website just bounced back to me. Here is the website: http://www.catedraldesevilla.es/cultural-visit/
Obviously 30 minutes isn't enough. I think they'd know that as well though so I'm guessing we can stay in the church longer than the closing time? Any experience?