Max length for external 15mm copper to outside tap?

[WaterTight]

With easy-use isolation inside, drain off at end (not that they'd used it), customer told to make sure they shut off and drain if weather getting cold, lagged and bagged etc...

Just wondering whether there is a reg for max lenght and/or what you'd personally consider too long?

Thanks

 

[Harvest Fields]

Personally I do not like any apart from the tap itself

 

[ShaunCorbs]

No regs I’ve seen them all the way round the houses

 

[Aquarius]

Personally I’d keep it as short as practicable, or better still use the ones with copper attached. Bearing in mind undue warming (From the sun), and prevention from freezing.

 

[WaterTight]

Cheers all.

No regs I’ve seen them all the way round the houses

That reminds me I've been meaning to take a picture of my entry for the Longest 32mm Waste Run In The UK which is on a building on the end of my road. Must be ten meters.
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Hope there's an anti vac trap on the other end