20 mins was decided as the spoiler

20 mins was decided as the spoiler. after standard cleaning is obvious:
1. in the second column of naked Thursdays. 1-3-6-7
2. cleaning obvious 9,6,8,5
3. in the second row hidden pair 1-3
4. in the second lower sector of the naked couple 8-9
5. cleaning obvious 9,8,8
6. in the first row naked triple 2-4-6
7. further cleaning of obvious moves