They have to be kept at a certain temperature all the time.

They must be kept at the same temperature as the air outside.

They can now be held at room temperature for a few hours.

They can be kept at room temperature for up to 2 hours.

Let stand until almost at room temperature, about 1 hour.

Men have been known to live, even to work in the open, at far lower temperatures.

Leave for about two days out of the sun at room temperature.

Keep it at room temperature and use within 28 days.

These may be made a day ahead and let sit at room temperature.

Let sit at room temperature for 30 to 60 minutes.