If you prefer to munch on them while they are in the tray, the mature greens can remain there for a few extra days, but please periodically check that they have a bit of water in the tray to drink! Otherwise, they might prematurely wilt over.
The greens may develop a slightly more bitter taste and fibrous texture if you don't harvest them within two weeks. We recommend harvesting all your greens right when they are ready and put any that you do not eat right away in your fridge in a baggie like the Stasher bag! They will last up to a week in the fridge like this.