How to stop Eclipse rebuild workspace?

I have in workspace near 70 projects. Sometimes Eclipse starts rebuild workspace, but I haven't made any modifications. Rebuild takes near 2 hours. How to stop it and do Eclipse rebuild only projects in which modifications were made? Thanks.

How do I turn off auto compile in Eclipse?

If you want to turn off auto Building your project, click the Project menu and uncheck the Build automatically menu. Also available in the Workspace settings: Windows –> Preferences –> General –> workspace --> uncheck "Build Automatically" box.

What is full rebuild in Eclipse?

For Eclipse you can find the rebuild option under Project > Clean and then select the project you want to clean up... that's all. This will build your project and create a new bin folder.

In Menu, Project -> Build Automatically (Uncheck it)