For the U.K. the B.G.A. give advice to be found in "Laws and Rules for
Glider Pilots" 14th edition June 2003.

Under "Recommended Practices":

RP12. The minimum length of aerowtow rope recommended is 150ft. However,
under special circumstances a short rope may be used. The operators'
attention is drawn to the following factors which may cumulatively
contribute to a hazardous situation:

(a) Low experience of glider and/or tug pilot
(b) Gliders fitted with C of G hook only
(c) Glider's C of G towards the aft limit
(d) Turbulent air in the take-off area
(e) Rough ground in the take-off area
(f) Significant cross-wind component.

RP13. After releasing the cable, the glider should turn away so that the
tug aircraft pilot can see clearly that the glider is free.

Under "Operational Regulations":

4.16 The sum of tows made by the tug pilot and the glider pilot, in their
respective capacities, shall not be less than six.

W.J. (Bill) Dean (U.K.).
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"Wallace Berry" wrote in message
...

Long tow ropes lessen the effect of tow plane prop blast on the glider.
Less chance of the glider dropping a wing on takeoff. This is a very
noticeable effect with my Libelle.

Tow ropes less than 200 feet long are just too short. 275-300' seems
about right to me.

Got towed with a 60' rope once (really short field). No problems but it
required much more precise flying.