Placement of duration in a sentence
Whenever you talk about FOR HOW LONG, you're getting into duration. It's not the same as a regular time word; it has its own rules.
Placement of manner in a sentence
Manner refers to HOW you do something, as in quietly, quickly, angrily, drunkenly, etc. This can be done adverbially (before the verb), but it's worth remembering that a complement works very well too.