My personal policy is to reply to serious emails within 2 business days at the longest. However, with the use of smartphones it is more than likely I will respond within 24 hours.
This form uses Formspree to submit. You will be taken to their website for a reCAPTCHA confirmation. Their service removes the need for PHP scripting to complete and email a form such as this.
My website is currently hosted on GitHub Pages which produces a static page that does not execute PHP.