Hi Denise,
Yes, although a couple more hours would have been nice too. We spent about an hour, or maybe a bit more, in the Cathedral. It was just as great as I remembered it.
We also had a pub lunch, and strolled around and shopped (I bought a pair of sandals, of all things), and walked the wall and a very nice park.
It might have been slightly longer than 3 hours, maybe 3.5. Very pleasant. Did not attempt to do the other touristy things, like the Canterbury Tales attraction.