Fabulous Collection of Hearts and Stars Foil Balloon Bunches, Filled with Helium and Delivered to you ready to Party ! We advise ordering for delivery the working day before you need them. Balloons should float for 3 to 5 days in the right conditions. The foil balloons can inflate and deflate in different temperatures and this is normal. Do not keep in extreme hot or cold areas. Once delivered and accepted we can no longer be responsible for the balloons.