Simultaneous opening of vuforia view experience

Hi,

I will need information to develop my project:
How many devices can open the same project at the same time on vuforia view?

I'm going to give at users a thingmark, which they can use whenever they want. I would like to know if all users scan the thingmark at the same time if the experiment is going well or if there is a limited number of users?

Thanks for your answers.

Maxime.