I have the bot running on my VPS and decided to leave it on while I went to sleep. I woke up to the bot just scanning the area and then walking to the next area. No pokestops, no pokemon, just walking around. Judging from the level of my character and bag changes, this happened not very long after I left the bot alone (perhaps 20-30 minutes), so I would estimate that this kicks in around an hour or so of uptime total if not less.
This is the second time this has happened, and while not a huge issue to just force restart the script after 30 minutes, perhaps this should be looked into further.
Behaviour
http://pastebin.com/raw/vjZMDAFZ