And I quote... from 5dimes; as it has been for a long time; as I copied and saved these rules when I first set up my account many moons ago
http://www.5dimes.eu/sb_rules.html#basketball
plusBasketball Wagering
Concluded NBA games are official after 43 minutes of play. Concluded basketball games scheduled for 40 minutes are official after 35 minutes of play.
Overtime scoring is included in the total when wagering on total scores. Overtime scoring is included in full game and second half wagers.
As someone mentioned earlier:Fourth quarter wagers do not include overtime unless otherwise noted.No bullshit about it. Live and learn.Read the rules before you play