I think flushing for 1 week with good drainage/runoff is good if you're not over feeding the plant. I know some people who really bulk in the nutrients towards the end and therefore wind up with a lot of excess. Since there will still be a fair amount of nutrients making their way through the roots and leaves, i feel like a week of at least 3-4
waterings will get all the buildup from the soil without full on starving the plant.
Happy harvesting, great colors on the plant. ✌️