LNB Shelf Life

Hi,

Would be grateful for any help on this issue. We are having to move our satellite dish for Sky Q because our neighbours have built a loft extension and it is blocking our signal. They have offered to pay to have it moved to the chimney but on phoning Sky I discovered their Special Access Team do not cover chimneys so if it goes wrong we would have to employ a private contractor. So my question is, does anyone know the approximate shelf life of an LNB.

Thanks for any help.