Half time duration

Question

I have read through the FIFA laws of the game and can see that the half time interval says:

Half-time interval Players are entitled to an interval at half-time. The half-time interval must not exceed 15 minutes. Competition rules must state the duration of the half-time interval. The duration of the half-time interval may be altered only with the consent of the referee.

We play amateur U18 football in the UK, with 45 minutes per half. I have looked through our leagues handbook and can find no mention of the duration.

Is it reasonable for the referee to insist on only 5 minutes half time interval?

The above rule was taken from the FA laws of the game.

Answer 1

Yes, but for normal the ref asks both teams if they're ok with it.

On the otherside, if it's realy cold weather mostly the teams asking the ref for a shorter halftime interval.

(If the ref blows the whistle after only 5min halftime interval, it's easy to max it for another 5min.)

Answer 2

Not more than fifteen minutes but not less than five minutes