A central home air conditioner does not drain in a single batch or set time frame; instead, it drains water continuously and in real-time as a natural byproduct of the cooling and dehumidification process. Whenever your air conditioning compressor and blower fan are running on a humid summer day, moisture from the indoor air condenses on the cold evaporator coils and drips steadily into the drain pan at a rate of several drops to a small stream per minute, flowing out through the PVC pipe as long as the system operates. If you are asking how long it takes to drain standing water from an overflowing drain pan during a blockage cleanup using a wet-dry vacuum, the process usually takes only a few minutes once you attach the vacuum hose to the outdoor end of the PVC drain line or use it to suck out the water directly from the indoor condensate pan.
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