Slow meteors are interesting. From the database of the observatory I extracted several events longer than 5.0 s. The longest meteor lasted 23 s and appeared the 8th of September 2018 at 02:58 UT. The second longest meteor was observed the 9th of June 2016 at 02:52 UT and lasted about 14 s.
M20091017_024258 Origin: Sporadic. Luminosity: -0.9 mag. Duration: 5.0 s
M20100911_004808 Origin: Sporadic. Luminosity: -0.4 mag. Duration: 10.1 s
M20120820_013714 Origin: Sporadic. Luminosity: -1.9 mag. Duration: 7.5 s
M20130616_212126 Origin: Sporadic. Luminosity: -3.2 mag. Duration: 6.8 s
M20130905_201127 Origin: Sporadic. Luminosity: -4.5 mag. Duration: 5.5 s
M20141124_232923 Origin: Sporadic. Luminosity: -1.9 mag. Duration: 5.4 s
M20150103_010327 Origin: Sporadic. Luminosity: -1.2 mag. Duration: 4.8 s
M20150103_201756 Origin: daD. Luminosity: -0.7 mag. Duration: 5.4 s
M20151101_171729 Origin: Sporadic. Luminosity: -0.5 mag. Duration: 7.0 s
M20151101_213658 Origin: Sporadic. Luminosity: -5.1 mag. Duration: 7.1 s
M20151107_173906 Origin: Sporadic. Luminosity: -0.9 mag. Duration: 6.9 s
M20151207_054246 Origin: Sporadic. Luminosity: -2.8 mag. Duration: 9.2 s
M20160314_022708 Origin: Sporadic. Luminosity: -4.8 mag. Duration: 10.8 s
M20160609_025154 Origin: Sporadic. Luminosity: -4.5 mag. Duration: 14.1 s
M20160809_001015 Origin: Sporadic. Luminosity: -1.9 mag. Duration: 12.7 s
M20160826_220343 Origin: Sporadic. Luminosity: -1.4 mag. Duration: 5.4 s
M20161015_181719 Origin: Sporadic. Luminosity: -0.3 mag. Duration: 5.6 s
M20161108_211757 Origin: Sporadic. Luminosity: 0.1 mag. Duration: 6.4 s
M20161110_000700 Origin: Sporadic. Luminosity: -0.5 mag. Duration: 6.8 s
M20161227_194904 Origin: Sporadic. Luminosity: 0.2 mag. Duration: 5.4 s
M20170102_015159 Origin: Sporadic. Luminosity: -1.0 mag. Duration: 7.1 s
M20170124_015350 Origin: Sporadic. Luminosity: 1.3 mag. Duration: 5.4 s
M20170311_041613 Origin: Sporadic. Luminosity: 1.2 mag. Duration: 5.3 s
M20170312_214454 Origin: Sporadic. Luminosity: 0.5 mag. Duration: 9.3 s
M20170327_234522 Origin: Sporadic. Luminosity: -2.0 mag. Duration: ~6 s
M20170420_014520 Origin: Sporadic. Luminosity: 0.1 mag. Duration: 5.9 s
M20170513_023601 Origin: Sporadic. Luminosity: -0.3 mag. Duration: 8.1 s
M20170706_020319 Origin: Sporadic. Luminosity: -2.0 mag. Duration: 7.4 s
M20170913_031751 Origin: Sporadic. Luminosity: 0.5 mag. Duration: 7.2 s
M20170921_204048 Origin: Sporadic. Luminosity: 1.0 mag. Duration: 5.0 s
M20171006_225042 Origin: Sporadic. Luminosity: 1.6 mag. Duration: 5.3 s
M20171010_213055 Origin: Sporadic. Luminosity: 0.3 mag. Duration: 5.2 s
M20171016_191601 Origin: Sporadic. Luminosity: -0.3 mag. Duration: 5.9 s
M20171130_170426 Origin: Sporadic. Luminosity: 0.1 mag. Duration: 6.1 s
M20171218_053954 Origin: Sporadic. Luminosity: -4.2 mag. Duration: 6.8 s
M20180908_025738 Origin: Sporadic. Luminosity: -2 mag. Duration: 23 s