title_body: How long will iced latte keep in the Fridge?
upvoted_answer: When I worked in a coffee shop and we prepared a beverage similar to an iced latte, we always mixed the milk in with the chilled espresso. Keep in mind this was a beverage prepared ahead of time and not server to the client right away.
  
  We NEVER added dairy to espresso and then chilled it for later.  It has been shown that 1 liter of milk can develop harmful bacteria after being in a room temperature space for as little as half an hour.
  
  I would highly recommend that you do not prepare your iced lattes completely with milk and then chill them.
  
  I recommend making the espresso, adding whatever sugar or flavor you want while it is still hot, chilling it in the fridge, and then adding milk to the espresso once it has been chilled or when you are looking to drink it. This will keep for a maximum of 48 hours.
  
  As with all coffee, the fresher the better, but if you are indeed looking for a quick way to grab an iced latte, I would do so in the manner I described.