Hi Dalwil,
I'm HSing a rising 4th grader and will be adding my rising 1st grader in the fall. I also have a 2.5yr old DD. I'd be happy to answer any questions. I'm just finishing up my 1st year so I'm still a newbie.
Hours a day depends on how on task your DS is and what you decide to HS. It takes us about 3hrs which doesn't include his reading time. DS takes frequent breaks and we have frequent interruptions from DD. plus we watch a lot of NOVA shows so that's an hour right there and DS has a history passion so he watches a history channel show or military show each day which is an hour.
For a 6yr old, probably 2hrs I'd say.
How old is your younger child?
We can continue this via PM Or separate thread to get this one back on topic if wanted.