Been quite a bit of discussion about plumbing layouts and using manifolds recently and on the back of this I need to run four 10mm pipes to two bathrooms to feed the toilet and basins. The distances involved are approx 15m and 21m to each bathroom , one bathroom will be used by our son when home from uni and then hopefully he will be moving out? and the other will be for guests. I am not overly bothered about the toilet pipes but is the distance for the 10mm pipes to the basins overly long or will people just have to be patient? TIA