If it was low on refrigerant, the compressor clutch would cycle on and off quickly. I suppose that if it were over charged, or very hot and humid, it would take a long time before it cycled off??? Is the compressor engaged, and blowing cold air?

Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph