ohu yeoseos sijjeum toegeunhaeyo.

오후 means PM/afternoon and is used to specify that the time is after noon.

• 오후 여섯 시 = 6 PM
  You typically include 오후/오전 when the time could be ambiguous (e.g., 여섯 시 could be 6 AM or 6 PM). In context (talking about work), people sometimes drop it, but 오후 makes it explicit.

쯤 means around / about / approximately. It attaches right after the time expression:

• 여섯 시쯤 = around 6 o’clock
  Placement is usually: time + 쯤, then the verb phrase.

It’s normally spaced as:

• 여섯 시쯤 (three chunks)
  시 is a dependent unit noun (hour), and 쯤 is a particle-like bound form that attaches to the time phrase, so it commonly stays attached to the preceding element: 시쯤.

Korean usually spaces a number and a dependent noun:

• 여섯 시 (6 + o’clock)
  This is standard spacing, similar to 세 개, 두 명, 한 번, etc.

퇴근해요 comes from 퇴근하다 = to leave work / to get off work.

• 퇴근 = leaving work (noun)
• 하다 = to do
  So it’s literally do leaving-work, i.e., leave work. In natural English: I get off work / I leave work.

-해요 is the polite, informal speech level (often called 해요체). It’s common in everyday conversation with people you’re not extremely close to, but also not in formal settings.
More formal alternatives:

• 퇴근합니다 (formal polite, used in presentations, work reports, etc.)
  More casual (to close friends):
• 퇴근해

Korean often omits the subject when it’s clear from context. This sentence commonly implies I:

• (저는) 오후 여섯 시쯤 퇴근해요.
  But depending on context, it could also refer to someone else if that was established earlier.

Both are possible:

• 여섯 시에 퇴근해요 = at 6 o’clock (more exact)
• 여섯 시쯤 퇴근해요 = around 6 o’clock (approximate)
  When you use 쯤, you usually don’t add 에. People do sometimes say 여섯 시쯤에, but it’s often felt as a bit redundant; 여섯 시쯤 is very natural on its own.

The -아요/어요 form can describe:

• a habit/routine: I usually leave around 6.
• a near-future schedule: I’m leaving around 6 (today).
  Korean present-form endings are often used for scheduled future actions when the time is stated.

Yes, you can say:

• 오후 여섯 시 정도에 퇴근해요 = around 6 PM
  쯤 is the most common, compact way for approximate time. 정도 means to the extent/approximately and can sound a touch more like give or take, but both are widely used.

Common ways:

• 몇 시쯤 퇴근해요? = Around what time do you get off work?
• 보통 몇 시에 퇴근해요? = What time do you usually get off work?
  You can add 오후에 if needed, but often it’s understood.

A few common points:

• 여섯 시 is often pronounced smoothly, close to 여섣씨 (due to sound linking and consonant tensing).
• 시쯤 has a tense ㅉ sound: 쯤 is pronounced strongly, like jjeum.
• 퇴근해요 is pronounced roughly 퇴근해요 (and often sounds like 퇴근해요 with the ㅖ/ㅔ variation depending on speaker).