No, it as I say above, it can be weeks or it can years - yes some peoples cabinet on here have been installed for over twelve months and are still not live.
Our cabinet was installed in February, they seem to install the cabinets first, then they put in the tie cables, power and fibre, but that could be in any order. There can be problems getting the fibre from the exchange - blocked ducts, the further from the exchange the greater the chance of blocked ducts, which have to be dug and replaced or cleared if possible, or there could be unexpected problems with getting power to the cabinet, there's so many variables.
One whole side of Margate, six cabs were held up because of block ducts recently, cabinets had been in for over six months, but I believe BT had to wait to dig up the road, one for the Olympic torch route, and then they had to wait to school half term, so not to cause to much traffic disruption, so as you can imagine there's a lot more than just running in a few cabinets. Those six cabinets all went live at the same time, so that one section of duct was holding them up.