Firstly eat every thread you can on stats and the levels you expect to play in the forums. Make sure what you are playing is comfortable for your available roll. A major mistake for people shifting to online is playing their live stakes as online stakes.
Get HEM2 or PT3 and get to know your hud and what your statistics mean in terms of how to adjust your play to be more profitable.
Start on your intended stake that you have worked out with one or two tables for the first 500 or so hands and if you are comfortable with the pace add a couple more. I just got back to the grind this week and im comfortable with turning 2k hands a day on 4 tables and looking at moving up to 6 tabling 3k hands by next week if my green line is on the up. If its not im sticking at 4 tables until it is.
Make sure to review sessions for leaks. Do a full leak review at least once a week with mini review after each session. Do not take a session as a sole indicator of performance. Variance over a session sample can look horrendous especially while adjusting to online. After 10k hands you can get some idea of patterns emerging and make some adjustment but depending on how quick you adjust to your level you may not see significant adjustment pointers until 50k or more hands.
Do not be too proud to ask for review from people in the forum in the know or even seek coaching from some of the reputable coaches here. They are worth what they charge for sweats and some of them here can pick up leaks that you would never spot yourself.
As for the 40 hours a week. A window cuz you cant kickstart a biscuit. Really you cant tell how long a person will take to be break even or positive if at all. That is down to how well you adjust and are willing to learn. I know people that redeposit every week and have a graph that looks like a San Fransico street. I know others that put away pride get coaching read review and adjust not only their game as a whole but their play for each situation and they havent deposited in years. I hope you fit the latter

Best of luck