twice
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In the ABA, they made it to the playoffs 7 times. In the NBA, they made it to the playoffs 16 times.
The Miami Marlins have only been to the playoffs twice, both times as a Wild Card in 1997 and 2003. Both times they went on to win the World Series
They have made the playoffs 25 times with a record of 17-18.
15 times
Since the Dallas Mavericks were established in 1980, they have made it to the playoffs 20 times.
5
26
27 times
Through the 2013 season, the New York Giants made it to the playoffs 31 times.
Through the 2012 season, the San Diego Chargers made the playoffs 17 times.
The Chicago Bulls have made the playoffs 29 out of their 44 seasons.