V Carve Pro Project run times

I run the latest version of V Carve Pro for designing projects and use Open Builds Control as my GCode sender. When I design a project and develop tool profiles I always look to see how long it will take to run the project. I know they are "estimated", but when I generate gcode and send to OpenBuilds Control the project doesn't seem to take nearly as long to run as estimated by V Carve Pro. For an example, I had a project that V Carve pro estimated that was going to take 19 hours to run, but when I loaded gcode into Open Builds Control software and started project it only took a little less than 12 hours to run (7 hours difference). Very hard to get good estimates on running projects when there is such a large time difference. To me V Carve Pro (with its price tag) should give a more realistic estimated run time. I mean everything is set up in the program ( Feeds and Speeds as well as bit selection). Am I missing something or is that just to be expected?

 

Thanks for the info. Just a little frustrating when working up a project. I mean when a V Carve Pro tells me something is going to take 19 hours and when loaded into OpenBuilds Control software and it only takes 12 hours. To me that's a lot of time difference/planning!! While running the program I timed it against what OpenBuilds Control calculated it to run and it actuality took just a little less time than it calculated. So to me OpenBuilds Control does a far better job at calculating job/machining times.