Night exposures certainly have that sort of leeway! And with my long carbon exposures certainly have many minutes leeway where it makes no difference if I expose at 90 minutes or 95 minutes!Determining Exposure Time
I love the Brassai method of determining exposure time, as he claimed to time his night shots by smoking cigarettes.
To gauge my shutter time, I would smoke cigarettes a Gauloise for a certain light, a Boyard if it was darker. Do others have a similar method of gauging long exposures? I have sometimes exposed salt prints by the time it takes to make and drink a cup of tea.
I wonder what kind of light he would have smoked a cigarette de chanvre for.