So depending on whether it is shared hosting or a dedicated cloud server the time taken to provision of the hosting services differs.
If your account is automatically approved, your machine user will be created and ready for uploading within 15 minutes of you signing up! If your account is not automatically approved, it will be within at most 24 hours.
It will take a little bit longer for your domain name to actually work on the web though! New domain registrations and DNS transfers typically take 24-48 hours to work while the DNS propogates across the Internet. By propogation what we mean is the time taken for all Domain Name servers to know which server IP you domain points at.
So in short it is very quick. Once you have an account you can login to it via FTP and upload your files or even install a CMS via softaculous in Cpanel (Cpanel is your hosting management portal).
If you have any problems don't forget to ask.
