I am currently checking every 10 min Wednesday, Thursday, Friday and Saturday and as soon as the system detects an update it sends emails out.
For more information about how often the system checks you can see the average check times here
Sometimes errors can occur when fetching new skins this is usually caused by a problem with the steam store.
I try to keep an eye out for errors but I can miss something so if you find a problem please do send me an email at contact@rustskinspy.com and tell me all about it.
A couple of friends of mine would reload the rust website all the time when it was time for new skins, but this meant just reloading without having any idea on when the updates came out. So to spare them from endlessly reloading the page I created this website to do the reloading for them.