A new Slab needs to cure for at least 28 days before a coating can be applied. The most important step in a successful epoxy job is slab preparation, which takes much longer than coating application. The adhesion won’t be there, and you can get delamination without correct prep.  But, if the floor has been prepped right, the concrete will fail before the bond. If the floor ever chips, the coating will pull up a piece of the concrete with it.