I landed a Skeeter in Gutersloh Army barracks in 1968 with 30 metres of kite line wrapped round the T/R shaft. The pedals were very stiff to operate.
Apparetly in Germany kites are limited to 50 metres of line but this will not stop any operator adding more line.
I know that I was 5-600 ft AGL or more during that flight from Detmold.