(Tech Test) Boiler Pool Math Question

Live in Norway...
Tomorrow Sun 24C
Rest of week shit weather.

Pool in garden, half full of cold water, 3.6 meters wide,1 meter high circular.
Tomorrow may be the last day of summer %.
pool water presently 18C

So

If i connect hose to boiler (1.5m high) and fill pool with hot water until it goes cold.

Question:
How long must i wait until the boiler is warm enough to rewarm the pool?

How long does it take to fully reheat the boiler, so that i can fill the pool twice with hot water? (or three times)

Kid will go to kindergarten in morning, and come back with some buddies to swim.
The day after i remove the pool.
Last day must be dream.

Your expertise is appreciated.

0
http://media-cdn.tripadvisor.com/med...ly-is-that.jpg

Hey, Zed.

I suggest tapping in to the nearest, Norwegian, natural, mineral spring that's got hot water. It sounds like too big a pool to fill in any other, more reasonable way.