''Gilda Radner used to call this an underrehearsed Broadway opening every week,'' says Mike Myers of Saturday Night Live's frenetic production schedule. ''And Fridays are the hardest-they're long, they're exhausting, they're very stoppy-starty.'' On Friday, Feb. 7, one night before Susan Dey's guest-hosting stint on the show, the cast's rehearsal didn't end until after midnight, with a conference-table meal of take-out Chinese food and popcorn. That night, Myers had a particularly busy show: His roles included Harry Hamlin, Danny Bonaduce, Mike Tyson's lawyer, a janitor, an art-museum visitor, and half of a blind-date duo. ''You learn to pace yourself,'' he says. ''You can be in nothing one show and 10 things the next week.'' For guest hosts, Myers has less philosophical advice: ''Just go slow,'' he tells them. ''And don't be afraid to look at the cards.''


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