New Apple Watch 7. How long to expect before it turns in when I am pressing the side button. It’s not lighting up

Hello Gjbv6676,

Are you pressing and keeping the side button held down?

This page here helps to provide some info on powering it on: Turn on and wake Apple Watch - Apple Support

Turn on: If your Apple Watch is off, press and hold the side button until the Apple logo appears (you might see a black screen for a short time first).

If it still won't power on, try out the steps from this page: If your Apple Watch won't charge or it won't turn on - Apple Support

1. Make sure that you plug the Apple Magnetic Charging Cable or USB-C Magnetic Fast Charging Cable all the way into the USB Power Adapter, then make sure that you plug the adapter all the way into a power outlet.

2. Make sure that you're using the Apple Magnetic Charging Cable or USB-C Magnetic Fast Charging Cable that came with your Apple Watch. 

3. Completely remove any plastic wrap from both sides of the charger. 

4. Make sure that the back of your Apple Watch and the magnetic charger are clean.

5. Position the back of your Apple Watch on the charger. The charger's magnets align your Apple Watch, and you should see a green lightning bolt  on the watch face.

6. If your Apple Watch still won't charge, force it to restart. Press and hold both the side button and Digital Crown for at least 10 seconds, or until you see the Apple logo.

7. Try a different Apple Watch Magnetic Charging Cable or USB-C Magnetic Fast Charging Cable, and a different USB Power Adapter. If your Apple Watch is out of power, you might need to wait a few minutes for the green lightning bolt  to appear after you start charging your device. 

Cheers.