First real test to see how long it would take for the Hill EC-3000 to top-up a Carbon 3 Litre bottle from 200 Bar to 300 Bar. The Hill compressor does pause at 75 Centigrade then restarts at 65 Centigrade for cooling purposes, and even with a total running time of just under 19 minutes, she only paused 6 times. The instructions does say that this compressor can top-up to 7 Litres, but personally I would keep in down to 4 Litres and below, purely on filling times, and number of pauses. Obviously never leave your compressor running without keeping an eye on it, safety first.👍