Arrays/Stacks/Queues

Consider the following operation along with Enqueue and Dequeue operations on queues, where $k$ is a global parameter.

MultiDequeue(Q){
    m = k
    while (Q is not empty) and (m > 0) {
        Dequeue(Q)
        m = m - 1
    }
}

What is the worst case time complexity of a sequence of $n$ queue operations on an initially empty queue?