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If I'm not mistaken... BEOS is added to your account every hour at about 28 min. past the hour last time I checked. If you hold Bitshares on the BEOS chain for even 1 full hour of the day, you'd still get some BEOS. I think there's about 28 million BEOS that get dropped per day. You get whatever percentage of that BEOS (whatever percentage of the bitshares staked for that day that belongs to you). You could move your Bitshares back off the BEOS chain, and then tomorrow decide to move it back on (of course you won't get any BEOS during that time window in which you've removed your BTS from the BEOS chain). Your bitshares are always yours and you can move them on or off the BEOS chain whenever you'd like, but you only earn BEOS in the hours your Bitshares are actually being held on BEOS blockchain. You can't tap into your BEOS until the 89 day rainfall period is over though. Technically there's some risk in transporting your bitshares and holding it on the BEOS chain, but I personally think that risk is minimal. The people at Blocktrades have had their hands in the making of this and they've seemed to do a great job. Plus I've followed stan a good bit and he seems to have his head screwed on right. I've moved my bts on and off and it's worked great. Also, I think there's an added benefit to having our BTS held on BEOS, because I think it gives voting power to these guys, and I like what they're coming up with. Though I don't understand all of it, their plans seem to make sense and feel right.

@twernli is exactly right, AFAIK...

The TLDR version is: YES! You can send your BTS back at any time.