Is it acceptable to leave an adjunct teaching position 10 days before classes begin? I have just very recently accepted a full-time teaching position at a reputable college (hooray!).  I've been employed as an adjunct the last several years with courses assigned to me generally well in advance of the academic term.  This full-time offer however has come in only a couple weeks before the start of the next term.  I've essentially given my other institutions only 2 weeks notice (only 10 days notice in the case of one of the schools) to find someone else to cover my originally-assigned course load (one campus had me assigned to 1 section, the other campus had me assigned to 3 sections).
It's now only occurring to me whether or not I should've given these institutions a heads up that I had an interview and was potentially leaving.  I'm not sure as to the etiquette in leaving a teaching position so close to the beginning of an academic term.  I honestly thought I would've received the results of my interview sooner than I did.  I'm curious though if telling these institutions that I had an interview would've made them rescind their offers of employment (generally a soft offer is made in advance of the term, and a contract is signed only once the term begins).  To summarize my question:

Is it acceptable in this situation to simply provide notice once an offer was put in front of me, or should I have given advanced notice to my other campuses that I had an interview and merely the potential that I would leave?  Would it be proper etiquette to give a warning to these institutions of a potential departure, or could that have resulted in rescinded offers of employment?

I suppose this is a problem that other industries don't run into; in normal businesses people can leave at any time with the work uninterrupted.  In academia however, institutions need to secure a reliable person well in-advance of an academic term and it's generally unacceptable for a professor to give up their teaching appointment in the middle of a term.  The institutions I'm leaving have rather large adjunct pools, so maybe it's not as bad as I'm worrying it may be.
I think it's generally agreed that it is unwise to tell an employer that you might leave, that nobody does this, and that nobody expects anyone to.  You only tell them when you are definitely leaving, which you did as soon as you knew.  You haven't done anything inappropriate.
Your old department head is surely not thrilled about having to fill your classes with 10 days to go, but it's their job to handle such contingencies, just as if you had been hit by the proverbial bus. You weren't under contract and so you're a free agent. I probably wouldn't expect them to hire you as an adjunct again, but it seems unlikely you'd want them to anyway.