Max Size of a Webhook

Max Size of a Webhook

I need to drive data from CRM to Creator using a webhook.  I understand how to do that and it works.  

The question is - how many different fields can I send in a webhook?  For example, I have 55 fields in my Leads module in CRM.  Can I send all of them in one webhook?

Is there an actual or theoretical maximum to the size of the url that is created by the webhook?

Thanks in advance
Jon