Trampy- I must have missed it because I looked for a section related to C-II time limits and couldn't find it anywhere in 21CFR1308 link. I did find something on the DEA site under 21USC1306.1-1306.11, but it still doesn't give a federal time limit, unless it is a "partial fill" and then the limit is 72 hours.

Could you post the link to the specific section including subsection, it would be a good reference to have. Thanks,

Here is the DEA Diversion site:
DEA