Hi @ZaidTahir,
You can find details about website load testing over on https://video2.skills-academy.com/en-us/visualstudio/test/edit-load-test-scenarios?view=vs-2019. I don't see any limitations with regards to max load, but I would assume it might be dependent on the hardware running the test.
Visual Studio 2019 will be the last version with this capability as it's being deprecated.