I often have weeks where I'll be lucid every day - I also have dry spells where I can go weeks without a single lucid (although this is always due to me getting distracted from performing any methods). When actively performing methods each night I'd say I typically have 4-7+ lucids in a week minimum, when not actively performing methods I still tend to have 1 or 2 but not always.

So I voted for: "I've been able to lucid dream for 1+ week" - because technically I have in the past, although not always.