It really depends on the horse, but start off by showing the water jump constanlty, walking inside it so the horse can get used to it, then you slowly practice jumping it
There’s not a set time period. But it’s all about how your horse will deal with it. Take it nice and slow by introducing them to it by walking them around it and then gradually picking up the paces. Then make it a small jump and gradually build up if they take to it really good
Watch eventiontv for tips on making it ea
I would say it depends on the horse.