That is a lot of walking to do when you have that amount of condylar bruising and other injuries. The brace will support it a lot, but still 70 minutes per day is probably too much at this stage.
Don't worry about being told you should have been in a cast, yes you should have been put in a brace with limited ROM early, but not a cast.
I think you will need to get a ride or a taxi for a bit longer sorry.