Get your cabinet and fixed to the wall , you will need it any way , you do not need to specify the type of shooting, ie rough or clays , or supply information of land you intend to shoot on , however all or some of this may come into discussion when the firearms officer comes a calling , so doesn't hurt to have all the answers , with regard to time scale , this i'm sure depends on the constabulary and their resources .
Norfolk for instance has one part time officer dealing with home and land visits , all licences wether new , renewals or variations .
good luck it will soon all come togeth