How long should I remove myself from screens before bed to ensure I get a good nights sleep?

I have heard 45 minutes-1 hour at the least. The blue light from electronics stimulates your brain and keeps you up at night.

1 hour before bedtime is ideal, gives you time to ponder and reflect back on the day… You feel more positive and seek peace without distractions…gives you enough time to plan for the next day too… And of course it improves sleep quality