How frequently are you and your team willing to spend that 20 minutes? Are you confident you evaluated it precisely? Are you always going to install the latest release? What do you do as the codebase grows and that 20 minutes turns into an hour?
Did you know there are businesses out there that are still using programs made in DOS era (especially those made in FoxPro) and work perfectly? Or did you took a look at ATM's and seen that majority still have that WindowsXP look'n'feel? Not everybody needs the latest and greatest, you know?
In that spirit, let's see your questions:
1-Once in a life time; 2-Yes;3-No;4-Nothing, see 1st answer.
