Just speaking from experience, I was a chronic masturbator until I got my first real girlfriend. I fapped anywhere from 1 to 3 times a day until Age 24. Then I started having sex and then cut it back to like 1 time a day alongside the sex. Me and that girlfriend-now-wife have sex very frequently but we both still fap a lot. I haven't had the time recently but for the last 10 years it hasn't affected premature ejactulation for me. When we started having sex I actually got winded faster than it took to cum. I'm more in shape now, but now it's like...
If it's early in the morning I cum WAY faster. But also so does she.
Any other time of day and it's the normal amount of time; the average.
On THC I can last for a VERY long time, sometimes to a frustrating degree.