i personally think you'll burn out well before you ever hit these numbers. If youd set a target to continue what you are doing for a 3mnth period, showed you can continue to do it and stepped up in intervals then i think you can do it pretty easily.
But IMO this is too big a step, when your roll is at that level where it can go busto pretty darn quick (not to say you will, but weve seen plenty of players who have)

regardless, gl with it, i just think you need to reevaluate 7-8 hrs per day is just going to burn you out pretty quickly.