There is no impact, after the battery is full, the phone will automatically power off, there will be no danger of overcharging, and the phone has a learning function, and now most of the mobile phone will self-adjust the charging time at night when it is charged for a night, to extend the battery life!
The iPhone is fully charged, so it's no problem to keep charging. Generally, an extra hour or so is good for the battery.
There is no impact, and now flagship mobile phones have ai learning functions, slowing down the charging speed after rushing to a certain amount of electricity, or no longer charging after full.