I bought 2 four inch pipes last year, one with a double outlet. With a four inch pipe you can fill an IBC tank, 1000ltrs, in about ten minutes.
I also have three one inch pipes and can fill an IBC, 1000ltrs in about 15 minutes.
Here's the crunch though. How close to the hydrant can you get, this will vary. I have needed to be 200 metres away from the hydrant, filling our drain jetter, continually.
200 metres of 4 inch hose will cost a fortune, from memory about £140.00 for 20 metres and when it has water flowing through it it is a nightmare to handle.
200 metres of one inch cost me about £360.00.
There's more to think about than just getting the tap, my one inch taps cost £50.00.
I said on a previous thread that a standpipe license for a months use in Islington was £120.00
Rob