A bit tangential, but just want to respond to your as someone who teaches singing and has to do a lot of talking in my profession - teaching (generally) involves a lot more talking than people tend to realize, and suddenly doing that after a long period will tire out anyone's vocal cords! I know my voice is typically shot the first week of teaching after summer break if I'm not very mindful about how I use my voice. This isn't like muscular atrophy though, the voice bounces back quick and adjusts to the increased use as long as you stay hydrated and don't push it too far past the fatigue and risk injury.