I have got some rope and dtuff for my basha now 
I cut the 3mm*50ft rope (15.24m) to roughly 3.80m lengths for the 4 lines to hold out the basha
and I am wondering what length I should cut the 7mm*50ft length rope to for the ridge line, as it is pretty damn huge, surely I don't need all that length, how much do I need of it for a basha. I can use the rest for practicing knots then and for general use if needed ever.
Thanks

I cut the 3mm*50ft rope (15.24m) to roughly 3.80m lengths for the 4 lines to hold out the basha
and I am wondering what length I should cut the 7mm*50ft length rope to for the ridge line, as it is pretty damn huge, surely I don't need all that length, how much do I need of it for a basha. I can use the rest for practicing knots then and for general use if needed ever.
Thanks