If you e-filed your return and are expecting a refund, you should get it pretty quickly. The Internal Revenue Service says most refunds are issued in less than 21 days. That's assuming your tax return is complete, has no errors and is not affected by identity theft or fraud. So if it's been more than 21 days and you haven't seen any sign of it, the IRS gives you several ways to track it down.
How long does dry ice last? The question of how long does dry ice lasts does depend somewhat on the purpose it is being used for. As a general rule, it will last for 18-24 hours in a cooler or ice chest, 3-5 hours outside and 15-45 minutes when reduced to a liquid form. If you are storing it in a cooler, make sure it is not an airtight one as when the ice melts, the gases could cause the cooler to burst!
Plan on using 5 to 10 pounds of dry ice for every 24-hour period depending upon the thickness of the insulated shipping container. This will keep everything frozen in a container up to 15 quarts.