Oz,. .. .Most, if not all, turbines require a 1 to 2 minute warm down, to allow temps to stabilise prior to shutdown. This is usually achieved during taxi in, often there will be a NL or N2 limit. In other words, if you exceed x% NL/N2 during taxi, the warm down period starts again.. .. .In the case of time on blocks prior to shut down for the DH8, the prop is hydraulically controled, for fine, coarse and feather. Consequently it uses a signifficant amount of engine oil for its pitch control.. .. .deHavilland recommend a minimum of 30 seconds idle after the prop has featherd, to allow the oil scavenge system to return the oil to the sump. Failure to follow this procedure will result in an incorrect oil quantity reading in the sight glass.. .. .Can't answer for SAAB or Beech.