Macarons last for 7 days at ambient temperature and for up to 7 weeks in the fridge, so they do have quite a good shelf life. However, when storing them at ambient temperature, it is probably best to keep them in an airtight plastic container, to keep as much air out as possible so that they don't dry out.

How long can macarons stay unrefrigerated?

They'll last for up to 24 hours at room temperature. If you've been baking in warm temperatures, place the container into a cool, dark cupboard. This will keep both heat and sun off the container, so it doesn't warm up the macarons inside.

Can you leave macarons out too long?

"Why Should I Rest My Macarons?" Letting the macaron shell dry out allows the outer surface to harden up so that when it is baked, the air in the batter will escape from the bottom edge (thereby, creating feet) instead of from the top of the macaron which can cause cracks and/or leave you with no feet at all.