Henock 72:15-16 (from the Ethiopian text, numbering by R.H Charles)
And the sun mounts up to make the day shorter and the night longer, and the sun returns to the east and enters into the sixth portal, and rises from it and sets thirty mornings. 16. And when thirty mornings are accomplished, the day decreases by exactly one part, and becomes eleven parts, and the night seven.
[4th month: sunrises & sunsets on the 6th gate (sunrise from east to north-east) ; has 30 days; day = 11 parts & night = 7 parts (14 hours of daylight); night becomes longer by 1 part]