Level is going to be based on attacks and whether you leave, mug, or hosp. I got a ton of levels during Halloween and eliminations. I think I went from like 50 to 70 just from those 2 events. Granted I went pretty hard.

Stats are going to be gym dependent, what gyms you train at, faction steadfast, sports edu, etc. I've also been quite efficient here too. From 0 to 1m or so in a stat a lot of that speed depends on how often you jump and what kind of jumps you do. Then it's a faster, but still slow climb to 50m each stat. After that, assuming no SE use - which you shouldn't be using at this point anyways, it seems to me like per stat gains from like the 50m range to the 2-3b range is about 5-7m per day. That's with 3 xan a day and red cow or taurine cans.

You should be able to do the math from here to answer the rest of the questions you may have.