This is the 15163rd most frequent Russian word.
получаса
"Получаса" means "half an hour."
The term 'полчаса' (half an hour) is used as a temporal measurement to express the duration of waiting.
Я ждал тебя полчаса у кафе.
I waited for you for half an hour at the cafe.
Here, 'полчаса' is used to indicate the span of thirty minutes from the current moment.
Через полчаса начнется фильм.
The movie will start in half an hour.
In this sentence, 'полчаса' estimates the duration required for traveling.