KavazovAngel: It asks for an update? It calls home every now and then? It doesn't allow you to keep being offline if you have been for a long time?
GoJays2025: Not according to
http://forums.steampowered.com/forums/showthread.php?t=1719532 You may say the mode might be buggy or maybe not exactly easy to use, but I'm pretty sure for the majority of users you can stay offline for months at a time without anything bad happen.
I certainly have been able to stay offline for at least a month, I used to run Steam via Wine on an offline Linux laptop all the time. IIRC, offline mode does require you to re-connect every 30 days or so, but otherwise, you should be able to stay offline. I say "should" because there are certainly plenty of reports of people who for whatever reason are unable to make offline mode work. I've been lucky enough to not have any problems with Steam whatsoever, not just offline mode or on Linux, but everything else about Steam and on Windows as well.
That being said, I still have some level of discomfort about the "worst case scenario" with Steam that everyone seems to fear so much: what happens when it goes away? Let's be honest, it really is not a question of
if Steam ever goes under, it's a question of
when. I don't for a second believe anything like that will happen tomorrow, but 5, maybe 10 years from now? Very possibly. I then have to ask myself if paying for these games with the expectation that in 5 years time, I might not be able to play them anymore is worth the expense. When it comes to full-price, brand new games, absolutely not; those games were already not worth the price they charge for them, no matter how good they are. However, the one day only and weekend sales, special package deals, etc., frequently worth it. I look at those prices as a game rental with a minimum 5 year return date. I will totally get my money's worth out of something like that.