CBS’ first-year comedy “Hearts Afire” will take a spring recess after April 5 as the network shifts another frosh sitcom, “Bob,” into its Monday slot and schedules the new Shelley Long vehicle, “Good Advice,” on Friday.“Hearts,” from exec producers Linda Bloodworth-Thomason and Harry Thomason, will return in repeats this summer. It is expected to be renewed, based on the web’s relationship with the Thomasons, who have an exclusive multiseries agreement. “Bob,” meanwhile, gets another shot at earning a place on Monday, where Bob Newhart appeared for seven years in his last CBS sitcom, “Newhart.” His current Paramount-produced show has had its order extended by three episodes, to 25, and will air at 8:30 p.m. (after “Evening Shade”) starting April 12. CBS gave “Bob” a previous shot on Monday in December, where the show posted a 13.5 rating/21 share in Nielsen. By contrast, it has averaged a respectable but lower 9.6/17 in its Friday slot. “Good Advice,” from TriStar TV, moves into “Bob’s” 9:30 p.m. Friday time period following “Designing Women” starting April 2. The network is hopeful the show (which co-stars Treat Williams) can pick up additional heat from Long’s return to “Cheers” as part of the ballyhoo leading to its final episode in May. The network is expected to schedule the Dudley Moore comedy “Dudley,” from Twentieth TV, at 8 p.m. Fridays and move “Golden Palace” to follow it, resting “Major Dad.” In addition, the TriStar comedy “A League of Their Own” will join the lineup in April, probably Saturdays at 9 p.m.