Does the length of the list affect the execution time when inserting an element into a linked list?

Inserting an element into a linked list usually does not depend on the length of the list if the insertion occurs at the beginning or end of the list and you have a reference to the corresponding node.

For example, in a singly linked list, inserting at the beginning is simply creating a new node and reassigning the head reference, which takes O(1).

However, if you need to insert an element in the middle of the list by index, you need to traverse the list to the desired position, which takes O(n), where n is the length of the list.

Thus, the insertion time depends on where exactly the insertion takes place and whether there is direct access to the required node.