[daemin]

That actually depends what kind of application you are building and maintaining.

From the sounds of it I assume you're talking about developing and maintaing a SaaS application, where there is no real maintanence of it, and instead what you end up doing is developing it further to support larger data sets and more people. That is of course assuming that the software is successful and the usage is growing.

For traditional desktop software you can declare it finished and then maintanence is minimal and limited to only critical bugs, so you'd have a team of 5 develop it and then 1 person or less maintain it.