How long does a bottle of foundation last you?

[beautybeauty]

I wear makeup most days and have just finished my bottle of MAC studio fix. I've only been using it for 6/7 weeks and it's not like I cake it on.
Is this about right? How long does your bottle of foundation last you if you wear it most days?
It's the first time I've stopped to consider how long it lasts me tbh. I don't even want to think about how much I spend on foundation a year

Over a year applying with fingers and only to the centre of my face.

Over a year. I use my fingers, and don't wear it in summer.

A year at least. I mix it 50/50 with Becca illuminating primer.