If a contestant won the right to a bonus spin in a Showcase Showdown (spinning the large wheel), Bob Barker always warned the contestant that the wheel had to make at least one revolution during the bonus spin or "it doesn't count and you don't get to spin again." The fact that the contestant would not get another chance to spin means that the insufficient spin WOULD count. However, the value on the wheel would be voided, so even if that spin would have won the Showdown, the contestant is disqualified. So the spin, in fact, would not count.
The announcer refers to the show as "The Fabulous 60-minute Price is Right." However the show is only 60 minutes if you include the commercials. Without commercials, the actual running time is closer to 40-45 minutes.