I have a multi-project (~10 modules) of which building takes about 20-30 seconds each time. When I press Run in Android Studio, I have to wait every time to rebuild the app,
You could try opening the gradle menu on the right side of studio, and assemble only the modules you have changed, then run the install command. When you press run it assembles everything regardless of any changes you you may have made to the code it is assembling