[ he nodded thoughtfully, even though the action goes unnoticed. ]
It may be enough, especially if you're here long enough. [ there's a slight hint of wistfulness in his voice as he continues ] There aren't many that last more then a month or two before they disappear.
[ which is fact that has troubled him greatly the last few weeks. The dome may be young, but very few seem to make it past the month mark, let alone two or three or four. Something to consider. ]