I do Catty1's way, for Vita for her peeing. I spray her cloth* on her collar every 3 or 4 days. If you start NOW, you should be fine by Christmas, leaving for a few days. You will know it is working, and there will be enough built up on the collar to last.
I didn't even bother with the plug ins. Locally 2 friends tried them and found it barely covered one bedroom, with the door closed. As I have the cats out and about in 9 rooms plus the cellar . . . . plug ins just weren't going to suit my needs. I needed something which is everyplace Vita is.
*I took an old T shirt of mine which I was going to toss. I cut a strip about 6 inches wide, starting up from the bottom. I cut it in half at the side seams, so I had 2 pieces, I could make 2 covers. Then I sewed each one up, then threaded her collar through one. It isn't fancy, or even pretty, but it works!
On the Feliway bottle, it specifically says DO NOT SPRAY ON THE CAT. So I make sure to only put it on the cloth cover. I'm not sure what would happen, and I don't want to find out!
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