Each stock would have its own rebuilding requirements, in terms of timelines. The rebuilding plan itself would define that period. You can surmise that for a certain species that timeline would be different, given the generation times, the recruitment to the stock, the ocean conditions it is facing, the predation, fishing pressures, and the like. That plan will define the timeline to rebuild that stock.
On May 24th, 2018. See this statement in context.