Mr. Leno continues to be a brute for work. Last year, even working 46 weeks on “Tonight,” he managed to perform his stand-up act on 160 dates. It is not uncommon for him to finish taping a show and then fly off somewhere like Fresno, Calif., where he appeared this summer at a chicken festival in 104-degree heat. He said he had just as many stand-up appearances booked for this year, even with the new show.