in everyday we say:

I love you for quite some time now!

In poetry we say:

I cant count the days where your smile was never in my mind,
I cant fathom goodness if your face is not around.
I cant count the week where i wept for your glance
realizing that I am always preaching at a distance.
I cant count the month, where I tried to forget you
but its been years and still I yearn for you.