What did your training look like prior to having 10-15 hours to train? How much indoor training experience do you have.
There’s a chance I’m reading this wrong but, having no rest day(s) is a bad idea. The body needs time to digest and adapt to the work you’re putting in. Adaptation doesn’t happen during the training. No rest could lead to a quick build up of fatigue and derail your training plans.
Personally I would look to divide your training time up into indoor and outdoor sessions. Why not save three or four of those hours for a nice endurance ride on a Sunday? Too much indoor interval work can be counter productive.