When you say three systems what do you mean, 3 rooms of equpment? Your dealer could take 30 minutes and program it like #(#*, or he can do a good job and give it to you a week later. It's very difficult to guage how long something will take because of other factors (dealer's workload, programming backlog, priority, etc).

You need to explain your system a little better and what you expect of the remote before you can get a reasonable time estimate.