Hi all, I have been asked to install a replacement door entry system for a block of 12 flats. All wiring and lock is in place about 10 years old. The existing system front panel was vandalised. It's audio only so a new external panel and new handset in each flat. Just wondering if anyone has done a similar job and how long it took? I am looking at the Bell Belini system from TLC Direct, Cheers, Graham.