With my whole team working from home, I want them all to join a meeting for the day so I can make sure they are actually working. 

Yes, this is advanced babysitting, and I wish I didn't need to do this.

It appears as if I can only schedule a 3-hour meeting.

I had been using a Google Hangout meeting that was open for basically ever in the same calendar invite.  Can I do the same with Zoho Meetings?