How do the payloads affect the DJI M400 flight times?

The DJI Matrice 400 flight times with varying payload weights:

• 59 min with the P1 / L2 / H30T (induvidually)
• 53 min – approx. 1000 g – H30T + V1
• 50 min – approx. 1500 g – H30T + S1
• 44 min – 3000 g payload
• 31 min – 6000 g payload