How would I handle bigger array looping in Python?

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Python

So, I have a function, that gets a call like this:

reversed("abc", "def", "ghi")

And has to return the reversed order like this (it is reversed by 90 degres - by this I mean if you stack them like this:

abc
def
ghi 

And then reverse them for 90 degress, you would get:

gda
heb
ifc

And then to upgrade via another function, that would get the same argument and a number of reverses. Like this:

reversed_n(("abc", "def", "ghi"), 1)

And would then return the tuple of what I would get by reversing the same order n times.
For this it would return:

("gda", "heb", "ifc")

What I have tried:

So I made the functions like this:

def reversed(kos):
    seznam = []
    kos = [i[::-1] for i in kos]
    i = 0
    while i < len(kos[0]):
        s = [beseda[i] for beseda in kos]
        seznam.append("".join(s))
        i += 1
    return tuple(seznam)


def reversed_n(kos, n):
    for i in range(0, n):
        kos = reversed(kos)
    return kos

So it works, but if I try something a lot larger, say a lot larger and put n = 10000001, it will run forever. What would I need to do, can it maybe be done with calculating if it is odd or even number of n?