Hoof growth rate is very individual and depends on nutrition, type of ground the horse lives on, work and type of year.
And it's not only about growth, but also wear. A horse with some conformational flaws will most likely wear his hooves unevenly and therefore needs correcting more.
I bought a yearling once who was so correct that my farrier refused to touch his feet. They were and wore perfect until he was three and we had a very wet winter which made a little rasping necessary. Another needed trimming every three weeks, otherwise his toes would become too long, the heels underrun. He was pidgeon- toed.
So, until we see these pics...........
Please, if you read this before arrival of the farrier, take BEFORE trim pictures.