go for it
I own my business and work full time at about 70hrs a week. It has slowed my growth a little but worth it. I have 2 full time guys and they have no problem completing there routes. Leaving you job just off 1 acct is a bad idea. What if you lose it you have nothing else for back up cause you quit your job. Find a way to make it work if you want it bad enough. I not saying I have done everything right but hopefully next year I will be able to quit after three years of doing both. If you want to chat more let me know.