Warmth

Sunsets are everything
Sometimes they fill me with immense joy, taking all the words right out of my mouth, leaving me speechless
Sometimes they fill me with such sadness, the kind i cannot find the right words to depict, leaving me silent

I wonder how many more sunsets I'd have to last without you

Long as in the length/duration of a period of time;
not As Long as in only if it lasts.