Nice job on the PH camera John and congrats on the first pictures. I've run your numbers through a program called Pinhole Designer to provide you with an exposure scale. I used it for a pinhole body cap I created and the times are pretty good.

http://www.pinhole.cz/en/pinholedesigner/

Pinhole camera exposure times
f number: 200
Exposure factor for f number 22: 82.6 x
Not including reciprocity failure

Time for f 22 Resulting time
1/1000 1/15
1/500 1/8
1/250 1/4
1/125 1/2
1/60 1 s
1/30 3 s
1/15 6 s
1/8 10 s
1/4 21 s
1/2 41 s
1 s 1 m
2 s 3 m
4 s 6 m
8 s 11 m
15 s 21 m
30 s 41 m
1 m 1 h
2 m 3 h

Created by PinholeDesigner 2.0, film database v1 (9. 6. 2003)
Copyright David Balihar, 2001-2003