Confirmed, threads in my test forum are being pulled every 24 days rather than hours. I imagine this is because the code in twitterposter_hot.php reads:
Code:
$vbulletin->options['twitter_hot_timespan'] = TIMENOW - ($vbulletin->options['twitter_hot_timespan'] * 86400);
As a work around until Milad fixes you could set
Hot Threads Look up Time Span = 1(for 24 hrs) in the admincp control for this plugin.