Trying to open my project this morning.
7 minutes! Arrrrg. Grumble grumble!!!
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That sounds like it has frozen, crash it and restart
Also post which version and file as a bug report if not done already 
It helps everyone that way!
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No, it just finished after I screenshotted. Project is not remotely large yet. Last LTS build.
GRUMBLE GRUMBLE
I haven’t noticed any issues with this taking a long time on latest LTS. Have you tried clearing the library folder and letting it rebuild? Should be fast if the project is small.
As my projects grew a bit (I have several, so they don’t go exponential, I use several Unity project for one real one in order to be able to separate some functionality while developing and import only the things I need in the master) I noticed it too, what helped me is to exclude the Unity folders (all of them, including my projects) from anti-virus software and the windows defender. Since then, everything is like a breeze again.