I recently was teaching my brother in law to homebrew this weekend. I was making 3 different beer Octoberfest, Foreign Extra Stout, and a Porter. I made the Octoberfest while he made the porter and he followed me step by step. All is well with those two brews. However on the stout, I had him try it on his own giving him tips as he went and reminding him of steps. While running the wort chiller I reminded him to aerate the wort before pitching the yeast. Well he forgot to do this step and the stout is showing no sign of fermentation. I ask him what the OG reading was and he doesnt know where he wrote the information down at (great plug for those of you who dont own a brewing app, this is a handy reason to get one) and he called me today asking what is wrong. I don't know what to tell him. Its been 44+hours and their is no sign of fermentation (fermenting in a glass carboy and pitched S-04 packet). The yeast was rehydrate for about 7-10 minutes before pitching. My told him it was fine and not to worry until 72 hours, but is there anything else I can tell him. I feel bad because this is his first brewing experience and I stepped out during the chilling, aerating, pitching process to catch the end of the football game. Thanks for the help!