thatd depend on the size of the pool, the width, depth etc, the rate of water flowing from your tap. you could use calculus to find the time it would take under these conditions, but why would you...
A 5/8" hose (the usual garden type) delivers up to 17 gallons per minute or 24480 gallons per day. Most pools will fill between 16 and 24 hours.
3750 L to take up swimming pool50 times 25 = 12501250 times 3 = 3750.
That depends on how quickly you put water in it. with a hose at home it should take about a day.
That depends upon how large the swimming pool is.