Yep, it's about 100 yards end to end Neil. Neighbours don't see me and if they do, they don't really care. It can get a little boring but last nite I was on a mission to prove my theories at close enough to 11 p.m. and where some have BS rises with activity, I'm the reverse.
As for keeping it up, I reckon I'll be good. When we move to Washington state next year (have our house picked out) it's gentle level ground among giant spruce trees so it'll be something to enjoy. Otherwise, exercise bike of some sort but for the time being, it's great and doesn't bother me as I get pretty fixated on the task at hand .... getting BS down and keeping fit.
Cheers mate
Mike