what is the running time of printing a singly linked list with time O(1) code example

Example: how to print the elements of a linked list in c

typedef struct node{
    int value; //this is the value the node stores
    struct node *next; //this is the node the current node points to. this is how the nodes link
}node;

void printList(node *head){
    node *tmp = head;

    while(tmp != NULL){
        if(tmp->next == NULL){
            printf("%d", tmp->value);
        }
        else{
            printf("%d, ", tmp->value);
        }
        tmp = tmp->next;
    }
}