How many people can use a form at once?

I am going to send my form to 100 families at once, I expect an immediate response. Will that recieve error messages?

There is no limitation on how many users can submit form. We have cluster of servers and capable to handle any spike in volume.

How are you going to send form to all your users? Are you going to use "PUBLISH" > "SHARE FORM" > "SHARE ON EMAIL". Please note that it has limit on how many reply / forward submission and share form on email you can send. I did check your account and found that you have bronze subscription which gives you 100 forwards / day.