which test cases are go to the regression code example

Example 1: how many test case in your regression

It depends on the project.
In my current project out of 1200 test cases 
in regression suite around %70 is automation.
We use 6 vm to perform parallelexecution it takes
3 hours to execute depends on the test data.

Example 2: regression suite

It depends on the project.
In my current project out of 800 test cases 
in regression suite around %90 is automation.
We use 10 vm to perform parallelexecution it takes
2 hours to execute depends on the test data.