I just re-ran some of the 1/2 and 3/4" lines in our basement. After
finishing, out of about 50 sweat solder joints that I did, 2 had small
leaks that needed to be redone. System has been completely dry for the
last 2 days now.

Question:
- Do most leaks do to bad solder joints show up immediately or do they
continue to show up over time?

Basically, since I did have a couple of bad solder joints I am
concerned that maybe some others are marginal and will fail later
(when I am not looking). Is that likely or does the initial
pressurization (along with some shaking of the pipes that I did)
pretty much show up the bad joints?

Thanks