This is the 304th most frequent German word.
stunden
"Stunden" means "hours" in English.
Here, 'Stunden' means 'hours' and refers to a duration of time.
Ich habe gestern drei Stunden lang gelernt.
I studied for three hours yesterday.
Again, 'Stunden' refers to hours, specifically indicating a span of time to wait.
Wir müssen noch ein paar Stunden warten, bevor der Zug ankommt.
We need to wait a few more hours before the train arrives.
In this context, 'Stunden' refers to 'lessons' or sessions of teaching within a school day or schedule.