On 24" base cabinets it seems that 21 -22 inch drawer slides are the most common, in some places they just don't stock anything over 21 inch.
Is there a reason for this? I realize that there are variables due to ff and inset, half inset, and full face doors, but when looking at cabinets, like the builtin's that I am replacing they have a full 2 " to 3" gap behind the drawers.
I don't see much said about drawer building as to sizing, recommended or other, other than the various joints and drawer faces.
Anyhow, there are usually reasons, and very good reasons for the ways things are made, which I am learning, a great deal in part to Swingman's advice. When one of you guys says to pay attention, a wise man listens.