fairly long period of time
「二時」 has another reading with different meanings.
two o'clock
二時ほど待ったがついに諦めた。
I waited for a fairly long time but finally gave up.
二時の間、静かに本を読んでいた。
I was quietly reading a book for a while.
二時ばかり経ってから使いの者が戻ってきた。
After a fairly long while, the messenger came back.