Signup / max number of advanced time slots 30?

It seems there is a limit on the number of advanced user time slots available within the SignUp tool, but no message in the UI to let the user know this.

To recreate:
Add a new meeting in the Signup Tool

Under slots, enter 35 

Select Advanced- user-defined timeslots

Select link for create timeslots

The first 30 slots will have the cal popup available

The last 5 will not.  

If you enter in a date manually in the last 5 and press save, the page will timeout.

Is there a reason that more than 30 can not be created?  Client states they have a use case for 40-50 timeslots.