Is a 12 oz shampoo bottle enough to last five weeks?

(assuming everyday use for like medium length hair a bit past the shoulders) if not, how long does a 12 oz shampoo usually lastIs a 12 oz shampoo bottle enough to last five weeks?
i use about half an ounce every time i shampoo, so it may last about 3 weeks if you ask me.Is a 12 oz shampoo bottle enough to last five weeks?
it lasts me for like 4 weeks

blush