4hr onsite response time in 24x7 service window: Customers can greatly benefit from fast response to their business critical issues with an exceptional service coverage window of 24-hour, seven day per week support. Once the customer’s incident is registered with the Lenovo call center, an agent will troubleshoot the customer problem remotely. If it is determined that an onsite visit in needed to resolve the problem, a technician is dispatched to arrive at the customer’s location within 4 hours. The response time (4 hours) is measured during the round-the-clock service window (24x7). So for example, if a call is placed at 3:00 a.m. on Saturday morning, a technician will be onsite at the customer location by 7:00 a.m., the same day, Saturday morning.