should i still use my iphone XR when its charging and its warm,

To protect the battery and the phone, should i immediately stop using the phone like stopping skype video calling, or other apps, WHEN the phone is being charged?

Because i notice the back of IPHONE XR was getting warm when i make skype video calls during charging, but i was planning to let the video call last for like 20 minutes, should I still do so? or should I stop making skype video calls and let it cool down and charge to full , and use skype only after it was charged fully. >?

or a general question about using Iphone when its warm or even hot,

to better protect the battery and iPhone,

Should i continue to use it for a prolonged time, like 1 hour or so, when it is already warm and even a bit hot ?