20. he’s as durable as they come
He stayed healthy last season, but had fewer carries than his normal workload here. The previous two seasons, he started strong but then got some knee injuries that slowed him down or made him miss a couple of games. I would expect at this point in his career, with the amount of wear and tear on his body, that those lower-body injuries can be expected. However, I'd also expect him to play through them, to the detriment of his YPC, unless he just absolutely can't.
I do expect him to be the starting RB throughout the season, but hope they do a better job of spelling him than they have in the past. Below or around 200 carries would be best for him physically.