This is another question when one has a home ed child and a child at school.
I home eded about five years ago and most of the day was autonomous, however we did do a maximum, usually much less, of 1.5 hours of guided work each day. My boys used to get up at 6am and would be fighting by 7:30am so I'd stick them into what I called the "school room" and we'd all be finished by 9am. I found that doing this every day worked but when we tried to have a long break over the summer, it was a struggle to get back into as they decided they didn't want to do it.
So my plan is to do a very small amount every day, possibly not at the weekends though, and not have term times. Obviously there will be days or weeks where we are on holiday or I implode 
and just need to get out for the day! But the issue I have is that my eldest son is at boarding school and it's going to be difficult to motivate my youngest to do some work when his brother is around. It will also be difficult to convince my eldest to do some fun work at the same time in the holidays so my youngest will do his. The other issue is that I've worked out that with all the holidays my eldest is actually not in school for 26 weeks of the year 
so that could be 26 weeks of the year where home ed son does nothing!
My methods may be different than others and what worked the may not work now but my youngest is very much a "give him an inch child" and very obstinate so he needs to know what my expectations are from day 1.