I have a played a lot of poker most of my life and am now in my 70's. Nearly all of my exerience in the last 25 years has been playing LH and NLH. I moved to LV in 2005, and since then have been playing 1/2 and 1/3 NLH Casino live, about 100 hours a month and about 30-40 hours a month online in the $50 and $100 NL games at WSOP (about the only place you can play online if you live in Nevada).
I have accurate records going back to 1990. (so I "know where I am at" in both LH and NL.
If you don't have accurate records for at least 2500 hours, any numbers you do have for a win rate may not be reliable, YOU MUST KEEP RECORDS. Amazingly, it seems there are many more players who don't keep accurate records, than those who do, even those who play every day!
If I were to pick one thing that has saved by butt over the years, it has been using record keeping softwawre that includes a management tool, that calculates your risk of ruin. The one I use (I am new to twoplsutwo so dont know if the rules allow me to mention the name of the software), lets you know what your risk of ruin is vs a given size bankroll; after plugging in your standad deviation, monthly expenses, hourly winrate-monthly hours.
I want my risk of ruin to be 1% or less, so I know what my bank roll and win rate have to be to achieve that. If you have outside income, (in my case SS), Subtract that from your monthly nut, this is the "real number" that has to come from poker each month.
Assuming you are a winning player with a solid winrate proven over time, it is easy to manipulate the other numbers and come up with how much time you need to spend at the tablles, what size game you belong in etc.
I hope there are those of you out there who find this information helpful.
bamboo