I tend to reward Eli very quickly when he gives me the canter I want. And that reward is walking.
Clearly, I am falling a few minutes short of how much we should be cantering.
But I don’t wear a watch. I have no idea why trotting doesn’t feel longer than the cantering but obviously it is.
So I think rather than timing myself, I am just going to canter for what feels like “too long” for me until “too long” feels just right. It might mean a more gradual build up to cantering enough, but I prefer than to being overtaxed.