Posted: 12/12/2016 at 22:40
There's some excellent advice on this site:
They say 75cm apart for a dense hedge. You will need to prepare the planting holes properly and feed and water them well for the first 2 years, so it will be a fair bit of work but this would apply to any kind of hedge if you want it to establish well. After that it would be mainly just pruning with a feed every few years.