How long for slow leak check?

[twoodrough]

Got a nice old tank off craigslist (from 1995!). The set up is actually in pretty good shape but I am checking for leaks. I have had it filled for 2 days. Is that long enough to be safe, or do I wait more?

 

[Fishandmusic81]

When I bought tanks off craigslist I read up to a week to be 100% sure

 

[Tetra1990]

It's up to you. Check the seals once in awhile. I bought my 29 off CL and the silicone was in rough shape. But it's been 8 months and still going strong. when I think about it, I run my fingers on the corners of the tank and on my hob filters just to make sure.