I tend to agree with those who change aperture instead of time. I try to keep exposure times around ten seconds or less but will change it to avoid a wide open or closed down aperture. I use an exposure meter to make it easy.

Quote Originally Posted by Bill Burk View Post
Really, I don't practice color processes because the chems don't keep 6 months. When it's a hobby, color doesn't give much "time" in the darkroom for the price.
This is a myth. I have had both C-41 and RA-4 developers, stored in full, glass containers last three years or more and give results which matched fresh developer. During that time the developer hardly changed color. Storing this way prevents oxididation. Others here on APUG have posted similar experiences.