I did mine in about just under 3 weeks in Florida. I would brag and say I was the usual "better than average" student, I was done in minimum hours. But it definitely wasn't a holiday. 0500 wakeup every morning, and fly as much as you can. I enjoyed it, but it was very hard work. I had excellent instructors though who made it possible.(hint: go to EFT)
I did go to Lollipops a few times though...
The immigration is a non-issue, 2-3 hours total to get everything sorted, hardly a big deal. Besides, I much rather deal with US customs and immigration people, than the spanish ATC.
People who say "Spain over US" are usually the ones who either have vested interest in Spanish aviation training, or as cockney steve said, "never been to either"