Could leave nominations open until the end of the week (so they'll have been up for 3 weeks, which I think is more than enough time myself?), but whilst it hasn't been done before, I wouldn't be against just having NF remain in the role for another year personally. Since Mech has abstained, he's the only person with the required amount of nominations needed to be put on the ballot and even if they're left open longer, we're not guaranteed to see any more noms and may end up doing that anyway.
"My name is Ozymandias, King of Kings:
Look on my works, ye mighty, and despair!"
Nothing beside remains. Round the decay
Of that colossal wreck, boundless and bare,
The lone and level sands stretch far away.