Kendrick Lamar and SZA's concert during their Grand National Tour typically lasts about 2 hours and 40 minutes for their combined performances. This duration includes multiple sets by both artists, with Kendrick and SZA performing a total of around 52 songs in a show that features elaborate stage production and thematic elements

. The full event including the opening act by Mustard can extend the total time at the venue to around 3 to 4 hours, as Mustard's set usually lasts about 30 to 45 minutes and the concert start times are often around 7 PM with the main acts starting closer to 8 PM and finishing around 11 PM

. In summary:

• Kendrick Lamar and SZA performance time: approximately 2 hours 40 minutes
• Opening act (Mustard): about 30-45 minutes
• Total event length including opening act and transitions: roughly 3 to 4 hours

This timing can vary slightly depending on the specific venue and show date.