This is the 464th most frequent Lithuanian word.
valandą
"Valandą" means "hour" (accusative case).
Here, 'valandą' is the accusative singular form of 'valanda' (hour), used to indicate the duration of waiting.
Aš laukiau valandą.
I waited for an hour.
In this sentence, 'valandą' again is used in the accusative case to signify a time period after midday.
Susitikimas vyks valandą po pietų.
The meeting will take place an hour after noon.
Here too, 'valandą' is in the accusative case, describing the time span that has elapsed.