NGC 7635 (the top pic): Exposure= 180s X 340 (17h) of which 131 were used for 6h 33m
SH 2-129 (the middle pic): Exposure= 240 seconds and 206 lights for a total of 13 hours and 44 minutes
M16 (the bottom pic): Exposure: 60, 180, 300 seconds
Number of Lights: 515 for 12 hours and 22 minutes of...