How durable is the voice?
The human voice is something extremely durable. Theoretically, each of us could speak or sing even 24 hours a day, with no apparent break. This can happen only if the voice is always treated with great care. Care does not mean becoming maniacs of vocal hygiene, but to fully understand all the mechanisms that regulate it.
We must learn to listen to the messages that launch our body to intervene at the first sign of a problem: it is always too late afterwards. I am finding more and more reckless people who, instead of bothering to identify the cause of a pain in the vocal apparatus, think to solve the problem by using local anaesthetics. An anaesthetic takes away the pain, pushing us to go further, increasing the damage to excess.
A healthy voice, which comes naturally to a person who has never abused it, is therefore super tough. However, the voice ruined and abused by a person who has treated it badly becomes incredibly delicate. It can subside in less than an hour's speech or in less than ten minutes of singing.
When you ruin your voice, or rather the vocal cords, it takes at least six months to hope to return to a state of normality from which to experiment with all its potentials. Anyone who feels pain during a voice lesson must be aware that they are going to find a reduction of its expressive possibilities by more than 50%, as well as a whole host of medical problems.