Schedule hours over multiple weeks in one entry

I'm going to have to stew on this for a while to see if I can make it work for us. This is for a forecasting schedule, so the times often go well into the future and can span many months, even years. But I like this idea of a child table (hadn't thought of that) and I may be able to limit the input to just the next 10 weeks or something like that. Thank you for the detailed response!