$$t = \fracVQ_s \times \ln\left(\fracP_aP_a – P_v\right)$$
Vacuum technology is the silent workhorse of modern automation. From picking up a silicon wafer to lifting a heavy cardboard box, vacuum ejectors (also known as vacuum generators) are the devices making it happen.
$$Q = 13.2 \times d^2 \times (P + 14.7)$$
Example: You have 1 liter of total volume and a suction flow rate of 100 L/min (1.66 L/sec). $$t = \frac11.66 \times 2.3 \approx 1.4 \text seconds$$
Have a specific application? Drop the specs (part size, material, cycle time) in the comments, and we will run the numbers for you.
$$Q_s = Q \times C_v$$