Aeon of miseries- That part (spoke) of the time- -wheel, during which there prevails miseries; it is the fifth aeon of the Avasaripiṇī (descending half of the time-wheel) and the second aeon of the Utsarpiṇī (ascending half of the time-wheel). Its duration is 21000 years.
(Sthā 1.132)
ekkavīsaṃ vāsasahassāiṃ kālo dūsamā.
(Bhaga 6.134)