Last week and mileage

Last week was my best week ever for mileage. I covered 201 miles (116 miles on road and 85 miles off road). I was pleased with this mileage but my legs were tired when I was riding yesterday, shows me that I still have a long way to go before transwales (344 miles off-road in a week). I was hoping to cover over 800 miles this month but I think I'll have to give up on that idea, unless I get out there and do 400 miles in the next nine days, I suppose I could look at it as a challenge, but it would involve some long rides on my own.