Roblox usually uses about 100 to 300 MB of mobile data per hour on a SIM, so 1 GB can last roughly 3 to 10 hours depending on the game and settings.

What changes usage

  • Simple games use less, sometimes around 20 to 40 MB per hour.
  • More active or detailed games can use 150 to 200 MB per hour or more.
  • Updates, downloads, and voice chat can add extra usage, sometimes a lot for updates.

Easy estimate

  • 1 hour of play: about 0.1 to 0.3 GB.
  • 10 hours of play: about 1 to 3 GB.
  • If you play daily for an hour, a rough monthly total is around 3 GB.

To save data

  • Use Wi‑Fi for updates and game downloads.
  • Lower graphics settings.
  • Avoid voice chat when you want to save data.
  • Check your phone’s app data usage to see your real number.

If you want, I can also give a quick estimate for 1 day, 1 week, or 1 month of Roblox on a SIM.