[pruth]

Why not just track the number of people who walk in and out?

How much added value does the sitting aspect add, considering that it would cost a lot of if you had to retrofit these onto your seats?

[jack-r-abbit]

Knowing how many people walk in and walk out tells you how many customers you served but can't tell you how long any one of them stayed. Knowing how long a specific seat was occupied can.

[soneca]

probably a good solution too. I think it will depend on the kind of business. Thanks