It'll vary a lot by your background and how much you play around along the way.
If you're pretty familiar with most of the concepts and stick to the requirements, you can do the whole thing in 40-50h. OTOH, if you're encountering new concepts and really want to internalize them and/or if you take fun detours then I'd plan on 100-150h or more.
It also varies by how professional you provide your solutions. If you start wanting to test things, give proper errors, etc., it will start increasing the time needed by quite a lot.
If you're pretty familiar with most of the concepts and stick to the requirements, you can do the whole thing in 40-50h. OTOH, if you're encountering new concepts and really want to internalize them and/or if you take fun detours then I'd plan on 100-150h or more.