Mine usually lasts about 4 to 5 hours on a good day.
2–3 if I’m running any sort of demanding app.
It’s not used all too often so I’m unsure if that will degrade over time though.

I got the refurb’d 15in. MBP with removable battery.

And yah, the battery can last anywhere from 3–5 hours, depending on load. It is awesome on top of insanely great with a side of super duper.

Beats the hell outta my Dell Latitude laptop, which, when I get a new battery (every 6 months or so) lasts no more than 100 minutes when new and quickly degrades to less than an hour.

i have the 15” MBP with the built-in battery, and it lasts me, depending on the number/type of programs im running, up to 6–7 hours.