Although they may seem to be the same thing, it is necessary to differentiate between the two aspects, as this can sometimes lead to misunderstandings.
The validity of the work visa refers to the date on which the visa will expire and expire.
The duration, on the other hand, stipulates the maximum period we can stay in the destination country.
There are countries where the validity of the visa may be, for example, 5 years, and yet the maximum stay allowed at each entry will be, for example, 30 days.