After having defined your project, you no longer need to take care of the analysis!
VE7 regularly refreshes the analysis in the background in order to take into account any modifications made to the code. This process continues when you are not using your PC, and is automatically suspended when you do use it.
Ultimately, you are not disturbed in your daily tasks and when you open VE you automatically benefit from a recent analysis of your code.
On top of run the analysis automatically, you also have the option to run it at a specific time and date. For example, set your analysis to run after work, so that you free up your computer resources during the day and have a fresh code analysis in the morning.