How long will it take a Katy worker to zoom past acres of newly paved prairie, over a now-uprooted prehistoric burial ground, and under EZ Tag toll sensors on a lunchtime jaunt to the outlet mall in Cypress? Maybe as quickly as 5 minutes, if the 200mph speed reached last week by driver John Hennessey in one of his company’s souped-up Corvettes on the 15-mile stretch of the Grand Parkway between I-10 and Hwy. 290 can be maintained. Of course, that might become a little more difficult once the new Prairie Tollway opens to slower-moving traffic for the first time this coming Saturday.