Personally, I'm just fine at impromptu public speaking, or giving a presentation, or just talking intensely for an hour or more, but 5 minutes of reading aloud

Personally, I'm just fine at impromptu public speaking, or giving a presentation, or just talking intensely for an hour or more, but 5 minutes of reading aloud gives me a dry mouth and tired jaw. Like you, I can't wait to be done. It's probably a practice thing; we'll see how I do when I have kids.