I heard the estimate was more on the order of 15 years. For now I'd say don't spend too much time thinking about it.
I wouldn't be so pessimistic about it though. We've seen a lot of estimates for fishery recoveries that are way out of bounds. Cowcod was supposed to be rebuilt in 2090 or somthing, it's been provisionally declared rebuilt already. And that was a similar situation in that they are both highly reduced, relatively slow-growing species that need to form large groups to have effective spawning.
Abalone didn't get reduced by human actions as far as we can tell. If these bad conditions were very common, or tended to last too long, especially since before human settlement, otters would've been eating them by the truckload too, then the abalone wouldn't have existed to this day. In all liklihood, this is an anomalous event that will at some point resolve back to a healthy ab population. We don't know if that'll be in 5 years, 15, or your grandkids' lives, unfortunately.