why does it take so long to render

1:50

4:09

13:11

13:11

3:36

23:36

10:04

12:20

2:15

31:29

6:53

6:53

3:45

8:13

5:13

8:19

7:26

8:59

6:09

2:20

28:38

8:59

9:00

3:01

5:24

3:29

4:25

5:46

4:24

11:47

18:08

4:24

8:19

14:52

5:20

1:52:02

10:01

12:18

8:19

6:07