ごろ
around (a point in time)
Time + ごろ (に)
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ごろ after a point in time means "around" or "about": 七時ごろ起きます, "I get up around seven"; 来月の十日ごろ, "around the tenth of next month".
The に that normally follows a clock time is optional after ごろ: 三時ごろ会いましょう and 三時ごろに会いましょう are both natural.
It only works with points in time. For "about" an amount (about three hours, about ten people), use ぐらい. So 三時ごろ is "around three o'clock" but 三時間ぐらい is "about three hours".
何時ごろ asks "around what time?", a softer question than a flat 何時.
Examples
毎朝七時ごろ起きます。
I get up around seven every morning.
三時ごろに会いましょう。
Let's meet at around three.
毎晩十一時ごろ寝ます。
I go to bed around eleven every night.
来月の十日ごろ日本へ行きます。
I'm going to Japan around the 10th of next month.
何時ごろ帰りますか。
Around what time will you be home?