I don’t currently have access to the exact location you’re asking about, so I’ll give a general approach and options you can use to find the precise time it starts getting dark for your area. Direct answer (general)

• It typically gets dark a bit after sunset. In most places, you’ll reach “civil twilight” (when the sky is visibly dark enough for everyday activities) within about 20 to 40 minutes after sunset, depending on latitude and date. For many mid-latitude locations in autumn, civil twilight often ends around 20–40 minutes after sunset, with nautical twilight a bit later and astronomical twilight ending even later. The exact times vary daily and by location.

How to get the exact dark-times for your location

• Look up your city and date on a sunset/sunset-timing site or app (examples you can use: Timeanddate, SunToday, or local astronomical societies). Check both:
  • Sunset time
  • Twilight times (civil, nautical, and astronomical)
• If you’re planning outdoor activities like stargazing, use the astronomical twilight end time to know when it’s truly dark.

If you tell me your city or location (and your time zone), I can give you a precise sunset time and the corresponding civil/nautical/astronomical twilight end times for today or any date you choose.