How do you get a dog with a full time job

I’m turning 30 this year and really want to get myself a Labrador. I grew up with them, we almost always had 2 at the house.

My question is, how do people do it? I can’t figure it out. I live with my GF of 6 years in an apartment in a garden square in London (basically a garden for residents but I would still need to take the dog out myself and cross the road etc.) I work 4/5 days in the office and those days are pretty brutal hours wise. My GF works 3/5 in the office and one of those days overlaps with mine. That leaves 3 days a week where the dog would be alone for over 8 hours. What’s the solution? I’ve heard people take considerable wfh time for the first month to train it. What’s realistic?