I definitely am not going to wait 5 days longer than the instructions say. But I still don't know what acetic acid is and whether or not it will harm my fish.
Yeah, 5 days is way overkill, 2 is sufficient, between 2 and 5, you would gain you virtually NOTHING!
When silicone cures, you smell the "vinegar smell", acetic acid, it is far below enough to influence PH after 24 hours. I just said 48 hours to error on the safe side, 24 hours is enough.
However, you may choose to "go that route"; good luck!
Regards,
TA