The time it takes to fill up a kitchen sink's drain with cold water from the faucet or waiting for the tap to run enough warm/hot water for one cup of coffee can vary depending on various factors such as water pressure, flow rate, and the capacity of the sink. However, in most cases, filling up a sink's drain with cold water is likely to take longer than waiting for the tap to provide enough warm/hot water for one cup of coffee.
Filling up a sink's drain with cold water typically involves allowing the water to run continuously until the desired level is reached, which can take several minutes or more depending on the size of the sink and the desired water level.
On the other hand, waiting for the tap to provide enough warm/hot water for one cup of coffee usually involves allowing the water to run until it reaches the desired temperature. This process can also take a few minutes, especially if the water takes some time to heat up or if the flow rate is low.
In general, filling up a sink's drain with cold water tends to take longer due to the larger volume of water needed compared to the amount required for a single cup of coffee. However, the specific timing will depend on the factors mentioned earlier.