On my Nexus S I couldn't scroll at all in either direction, and the right side of the graph was cut off.
Slightly relevant data point of approximated anecdotal evidence: I submitted a "Show HN" for my Android app at about 2 PM on a weekday and got 1 or 2 upvotes within about an hour, so I deleted it and resubmitted it later at about 9 PM (exact same title and everything - I felt bad about resubmitting it but I was really disappointed, sorry if this was a faux pas) and it hit the front page within 5 minutes and hit #1 in about half an hour and then stayed there for 12+ hours. Pretty astounding difference...
Slightly relevant data point of approximated anecdotal evidence: I submitted a "Show HN" for my Android app at about 2 PM on a weekday and got 1 or 2 upvotes within about an hour, so I deleted it and resubmitted it later at about 9 PM (exact same title and everything - I felt bad about resubmitting it but I was really disappointed, sorry if this was a faux pas) and it hit the front page within 5 minutes and hit #1 in about half an hour and then stayed there for 12+ hours. Pretty astounding difference...