Does frequent charge hurt battery life span?
How not to charge the phone when it’s plugged into car for gps navigation? Does frequently plug and unplug the phone to the power outlet hurts the battery life span?
No, you can charge the phone whenever you want for as long as you want. You can't overcharge it because the phone is "smart" and will stop charging at 100%.
Here's the long form answer-->When to charge your iPhone or iPad - Apple Community