I went to Panama a year ago, and picked up the local paper at breakfast and was surprised that I could get the general gist of the main story, so I thought - why not try and learn some more. So I got Pimsleur's spanish and did course 1 and 2. It is 60 lessons, an hour a day so should take 2 months. It took me a year !! A lesson would take me a week.
I figured that was too slow, so I searched the internet found what I think are unbelevably priced one on one Spanish lessons; 50 minutes one on one for the cost of less than 2 beers, and have been doing it 5 times a week for 5 months. It keeps me out of the bar, somewhat, I'm not bored, just frustrated at how poor and forgetful I am, and one day I will stop. I will probably never use it, so to some extent it is a waste of time, or it could be seen as a harmless hobby. I committed to myself that I would do it for a year, and I probably will, and we will see where it goes from thre.
They say education is never wasted so why not ?
Unfortunately I don't have a better reason.