Level 1-40 is possible in about 16 hours give or take. Faster if you use combo pots.
Another 16 hour session should get you to early 50s.
Another 16 hours and you can break the 60s.
Best to do as much grinding when it's nighttime for Europeans as possible. Less competition for grinding spots and less pks. Probably less GMs online to catch you botting if you're into that kind of thing but botting is slower.
Only thing I need to know now is how many lens stones and combo pots I'd need to level to 60 and I'll start my own PL service.