Be careful about straining your voice cords. Dictation is only fine if you’re using it sparingly.
Example of a non-strenuous dictation task: if I am driving, my Android will read my texts and allow me to reply by voice, a speech-to-text and text-to-speech task that is damned handy.
Conversation between multiple people doesn’t involve one person speaking continuously for hours. As such you can spend a lot more hours per day dictating than is normal, that’s the risk not simply talking an extra 20 minutes per day.
Most correspondence throughout history was dictated.
Dictation for a few hours is a lot more stressful than normal conversation and you’re also speaking in your normal life, it adds up.