A Grubhub background check typically takes 3 to 7 days to complete. However, the exact time can vary depending on several factors, such as:

1. Location: Background check processing times may vary by state or country.
2. Volume of Applications: Higher volumes of background checks may cause delays.
3. Accuracy of Information: Any discrepancies or need for additional verification can lengthen the process.

Grubhub will notify you when your background check is complete, and you can check the status via their platform or app.