298185 Tue Aug 17 11:55:58 -0700 2004 3 27 General Chowhounding Topics 0 1647961 hi, everyone - wondering if anyone knows how long homemade mayo lasts. i'm bringing in sandwiches for my co-workers tomorrow and i want to use up the homemade mayo that i made on sunday. will it still be good tomorrow? is there a way for me to test if it's still good, short of angry co-workers queuing up for the office toilet? thanks in advance. Tue Aug 17 11:55:58 -0700 2004 0 diep 1 1648022 I think I've heard about 5 days. Of course you should probably let people know in case anyone has a weakened immune system. Tue Aug 17 23:07:21 -0700 2004 1647961 0 John Scar 1 1648023 taste it, if it tastes off then dump it Tue Aug 17 23:34:45 -0700 2004 1647961 0 Candy 1 1648159 Homemade mayo is unfortunately risky because you have to use raw egg yolk, a possible source of salmonella poisoning. I would not recommend keeping it overnight. Thu Aug 19 18:01:23 -0700 2004 1647961 0 Jon