What is the fastest response time you can provide?

We split our maintenance contracts into three types including 4 clock hours (the fastest response time), 8 working hours or 12 working hours. The 4 clock hours is a 24/7, 365-day a year maintenance contract. We have been known to offer up to 2 clock hours but this is only feasible if there are one or two local engineers, who are literally on the site’s door-step.