This can prolong your latex balloons for several more hours and possibly several days depending on how hot it is in the area the balloons are placed. The 6040 inflater works best with balloons larger than 14 inches. Latex is a light material so you will be ok helium-filling balloon sizes that measure 9 inch and upwards. Will stay afloat for around 16-18 hours but will come down quite a bit quicker if left. Foil balloons, on the other hand, may stay floating for weeks but will. Have a violent reaction to a sudden temperature change (both hot and cold).