I don’t remember exactly, but it wasn’t a lot. My weekly mileage is definitely higher now than it was back then. My issue was that I was pushing my pace going as fast as I could every single run. Plus I didn’t do any sort of strength training back then.

Now I’m doing strength training on a regular basis and have plenty of easy/ zone 2 runs in the mix.

People who run everyday are almost certainly incorporating easy runs to allow for active recovery between harder runs.

Just don’t add too much mileage to quick and you’ll be fine. Don’t go from 3 days a week to 6 in one week, and pay attention to your weekly mileage. You don’t want to add more than ~10% per week.