Air assist pause

Have a compressor set up which takes 30s to build pressure on first power on. Using m8 to turn on. And off a demand valve and if I get m8 I ensure compressor is on. (small logo plc runs compressor).

So question is if on change of layer can I get a pause after the m8 comes on (for the first time} so compressor can build pressure, once pressure is up compressor will remain, on for 20mins so not an issue through rest of layer… Dont want a a pause at every time m8 goes high only first time.

I assume a macro should be able to do this or a bit of gcode… Bit like this

If air assist=on then
m8
wait 30s
start cut
Else
Start engrave
End if