My advice may sound a little different from everyone elses but here it goes.

But to start at the moment I currently play min of 18-24 tables running in 1000 hands per hour. But this was not how I started read below maybe this helps.

I started out playing nl2 with a $100 roll online. I got the money when I was dealing at a live local game. As I began to play I began mutli tabling. My Poker Tracker software was bunk at the time so I don't know how many hands I played. I played here until I made my roll into $300 and then moved to nl5. At this point I was playing 12-15 tables so as I played. I realized I needed a bigger bankroll than the 20-30 buy in's normally quoted for cash game play. I have probably played 360K at nl5 and had boosted my roll over the 1.5k mark. I was running roughly 9/100bb over 300k hands.

Normally I think a +3/100 over 100k hands is a good point to determine if you are winning at that level or not. I do not know if the correct version is +3 ptbb/100 or just standard +3/100.

I stayed at nl5 for a while longer taking shots. I changed my bankroll requirements which after I started mult-tabling from 50 buy in's to 100 buy in's. I reached 100 buy in's for nl25 and took a shot. The previous level I was playing at was deepstacked so it took a session or so to adjust to 100 bb's vs 200bb's. I rolled 70k hands only to see that I was running at -.02/100. And then ran into a two session 12 buy in downswing. You should have seen my ev line . Anyway despite the cooler downswing I realized that there were some big holes in my game so I moved to the nl 10 level. Which was the first level with 100bb's but had the same max buy in as nl5. To see if I could find the leaks in my game and recoup some of my losses.

But for me achieving at least 3/100 over 100k hands is a start to know I can beat a level. Not just hit a heater and think I can beat a level because now I am rolled for the next. And move up and get busto'ed.

Also at these lower stakes were say at nl10 1bb=.10 3/100=.30 so a 3/100 winrate over 100k hands should show you a profit of $300 over your bankroll.

Something to consider also, is an example over last week I played 30k hands and during the weekend I got coolered to the point were I was -12 buy in's below my ev line. So even though you might not have the achieved results over your hands dosn't mean you cannot beat a level if you have evidence as such things as this. But I wouldn't use this mainly as an example of why you are not beating a level or not.