This is also a concern for me because I am working full time and want to homeschool. The homeschool coordinator at International British Academy was very helpful and assured us that 4 hours per day of study will do just fine.
So my husband and I will split 2 hours per day with our 3 and 6 yr old. Good luck to us in our homeschooling journey!
I found a few bloggers in wordpress that post their activities and progress also, it's very reassuring to know that it is a larger movement and you do not feel alone while homeschooling, other parents rock at it, we will too. ;)
It is really comforting/reassuring that there are plenty of support system for parents like us who want to homeschool. I think that bottom line is, both parents need to invest time and exert effort if we were to make it work. 😉
Best of luck to both of us, i will follow you and hopefully see more of your homeschooling journey.