service scheduling is inaccurate. 4 hour windows are way too long - especially compared to other service providers these days. 4 hour window can cause one to miss an entire day of work. Think... service scheduling is inaccurate. 4 hour windows are way too long - especially compared to other service providers these days. 4 hour window can cause one to miss an entire day of work. Think about it, if your window is 8 - 12 and the tech arrives at 12. You just missed your entire work day.