OK
My last post for this subject.
The issue was not intended to be specific to TR, but as most all the replies have been let's look at it specifically. It is fresh in my memory.
On a pre cart design, one can probably fairly say that, on average, as a walker I (at least) keep up with the pair in the cart because -
1/ A hits it left, B hits right, and by the time they've figured which 4 clubs to carry over to the ball I'm at my ball and we hit in the correct order.
2/ Walks from green to tee are seldom long.
3/ There is generally a direct walking route which is shorter than the cart route.
4/ Having the bag available by the green saves time.
The following features at TR add to the walk time
holes 2, 8, 13, 18 - no direct walk route
green to tee long walks 9-10, 12-13, 14-15
The prevalence of the elevated tee hitting over waste areas. The intial 50 - 100 yards on many holes is tough going. Carts whizz past this.
All of which is not to say that TR is unwalkable - I did walk it, twice. I like a good walk. I do not like to hold up my playing partners.
In my estimation, as a walker, I would slow down my playing partners by at least 15 minutes over 18 holes, that is conservative. I would not be comfortable with that.