Michelle,
Unfortunately, I can't say exactly how long it takes, because they started to split sometime after I went to work Friday morning (8:30ish) and were nearly done when I got home (4:30 or so). The time that elapsed between the 2 photos was maybe 10 minutes. And that was the second one. The first one had already split and taken a walk. 
I'm pretty sure those tenticles end up with one or the other. I wanted to watch the whole thing, but it's like watching water boil. Nothing seems to happen when your staring at it, but as soon as you turn your back, everything happens. 
__________________
Katrina
90 Gal AGA with 2-250W 10k AB DE MH, 220W VHO, Turboflotor 1000, GEO calcium reactor, Pacific Coast chiller, DIY phosphate reactor and nilsen kalk reactor, sps, clams, zoanthids, rose BTA, ocellaris clown, 2 green mandarins, royal gramma, purple tang, sargassum trigger, flame hawkfish, coral beauty, neon dottyback, purple and blue linckia star, brittlestars, snails, snails, snails
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