I've just received my second mechanical watch in the mail, making my collection: one quartz, two automatics. The quartz watch is no concern, as it keeps ticking oblivious to who's wearing it or what's going on. However with having two mechanical watches now, I'm realizing that one of them will be sitting on my desk for long periods of time without use. I don't mind having to reset and wind the watch when I want to wear it (actually I enjoy setting and winding watches oddly enough) but...
I'm concerned as to whether or not it is harmful for a modern mechanical (automatic) watch to sit for days or weeks without being worn or wound. I've heard two sides to this argument, one saying that the oils will congeal... BUT other people say that with modern synthetic oils (used in modern watches) congealing isn't possible.
So, is it okay to leave a mechanical watch sitting dead for several days or even weeks? How about months? Another reason I ask is that I'll be taking a trip overseas soon, and want to take only one of my mechanical watches, meaning the other would be left home without winding or any movement for a couple of weeks. I really hate the idea of watch-winders, and will only purchase one of it's necessary to preserve the longevity of my watch, otherwise I don't want any part of it.
What do you think? Do I need to purchase a watch winder?
P.S. There's a good chance my collection of mechanical pieces will be growing in the future, so whether or not I NEED to wind them each and every day to preserve their longevity is a real concern I have... Please help me put my mind at ease by knowing what to do : ) Thanks !!!!!!!