Generally, long distance rides are centuries and longer distances done in a single day or a longer distance like 300 miles done in a limited time like 48 hours.

"Touring" has a number of different usages. The usage that I think the forum has is also called fully loaded touring. In this version, the cyclist puts front and rear panniers on his bike and rides as a self contained unit. He carries his own food, tent, cooking equipment and so on. It is sort of RVing on bicycle. Credit card touring is where the cyclist carries his change of clothes and toilet articles but he eats at restaurants and stays at hotels.