Formidable form building is one of the best and most extensive, fully customisable, WordPress plugin out there. You can create all types of forms you can think of. From a simple contact form, to a complex booking form, or even a full-featured user database with lots of filters and search features.
But even if Formidable Pro is this powerful, there are still some things that Formidable Pro cannot do. One is allowing different number of slots per hour of the day. Out of the box, Formidable’s calendar and time field can let you limit the number of slots per day by a few lines of code.