Derate factors definition

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eeStud

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I am running STA with 2 corners (fast & slow).
How should i define my derate factors to check setup and hold?

Thanks!
 

First, why not to run 2 times STA for each corners?

here what we usually use:
set_timing_derate -late 1.08 -clock; # 8% margin on clock
set_clock_uncertainty -setup <value> [get_clocks *]; # custom margin for setup
set_clock_uncertainty -hold <value> [get_clocks *]; # custom margin for hold
 

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