Refilling 1lb LP cylinders.....

I bought a thingy to refill my 1lb cylinders off of the 20lb tanks and going by the directions, (Keeping them chilled in the freezer and filling for *exactly* one minute), the refilled cylinder only lasted about 30 mins in my buddy heater as opposed to 4.5 hours from a new one. Am I doing something wrong? Should I go longer than one minute? When refilling, it seemed like most of the gas went in for a few seconds only, then the rest of the time I didn't hear anything really. The 20lb tank was full btw.......anyone with any thoughts?


[glow=red,2,300]Happytrails.........[/glow]