I (29m) planned to take two days for a hobby and my girlfriend (27f)is expecting me to reconsider

This year has been stressful for me as I've had a lot going on with family while also having final exams and other assignments through work. Video games are a hobby I've enjoyed since I was young and I usually get new games whenever they come out.

I haven't had the time this year so I said I'd get myself the games that I have wanted and play them for a two days over my time off work between Christmas and New Year. I’d still play them after this but it would just be when I age the time so only a few hours a week.

My girlfriend has known about this since I planned it a few months ago but this weekend mentioned that she doesn't think I should.

She said it'll be expensive getting them all and that I shouldn't be spending that much money on them at once and that it is a lot of time to spend on them when we're off work.

The games will be around £40-£55 each unless I can get the money sale and I’ll be getting them between now and Christmas.

I pointed out it's my money and that I'd still be able to afford bills and the plans we've got so it's not really up to her how I spend my money.

I pointed out we've got a lot of plans over the time off over Christmas so me taking a couple of days for myself is not an issue since the majority of the time off will still be spent together. We have plans on 10 out of our 12 days off.

She said I should be listening to her and open to changing what I had planned so I should only get one or two games and only spend a few hours on it.

I refused and just repeated again that it's my money and time and it doesn't impact anything we have planned.

Does anyone have any advice on how best to approach this or have any other views on it?

Tl;dr my girlfriend and I get 12 days off over Christmas. We have plans for 10 of the days so I planned to take two days to myself, she’s saying I should be shortening it and that I shouldn’t be taking two days.