Reducing Maven build times

[Nick Minutello]

Is there any way to get Maven to avoid building a project once it has
already been built and none of the source/dependancies changed?
 
Currently, if you run "dist:deploy site:deploy jar:install" it will
compile/javadoc/etc etc multiple times and it takes ages.
Consequently, our automated project build (made up of two maven
projects), using reactor, takes 13+ minutes...
 
It would be nice if there was some equivilent of Ant's <uptodate> task
and "unless" features....
 
Regards,
Nick