If the object being burned has a spatial periodocity, then the active area of the burning usually remains bounded and so eventually develops a periodicity too. It is unknown whether this will always occur.
The speed of burning can range from arbitrarily slow up to the speed of light. The results of burning can be clean (leaving no debris), or leaving debris usually much different from the original object. In rare cases, a reburnable fuse produces an exact copy of the original object, allowing the creation of objects such as the telegraph.