AIW for using 5 days annual leave to play video games?

I have been with my gf for over 4 years. We live in the UK and I currently work full time and through my job, they pay to put me through a lot of exams. I na due to finish them over the summer.

As a hobby I like to play video games to unwind. I mainly play single player games since I like a good story. In September-october there are quite a few games coming out that I really want to play.

I decided as a treat for myself for doing the exams I would take 4-5 days leave to have a nice long weekend in October and enjoy playing them. I mentioned this to my gf and she said it would be a waste of leave since I get 10 days off over Christmas anyway. I pointed out that I'd be busy for most of that since I'd be seeing family on Christmas day and boxing day, my gf and I have plans to go away for a couple of nights etc so while it will be a fun 10 days, it won't be relaxing.

She just repeated its a waste of leave especially if we're looking at a small holiday abroad in January-February time. I told her this won't affect that and I'll still have the leave. I told her it's my leave to use as I please and me taking a week off in October does not affect her at all.

She just repeated that it's a week less that we'll be able to use for things for us both to do.

AIW for booking 4-5 days off to play video games?