Comment by 9NRtKyP4

It seems to be 7s, at least in ntoskrnl.exe 10.0.22621.1105:

  ; PopPowerButtonWorkCallback+0x1DF
  shr  ebx, 1          ; unpack elapsed milliseconds
  cmp  ebx, 0x1b58     ; 7000 milliseconds
   jb   ...            ; below threshold: skip crash path