LOL, the Great Adenium Plant In The Sky is laughing at all the difficulties we're having, hey? Sad that we, in our ill efforts, are killing so durn many seeds and seedlings! Erghhhh.
I have some that I'm trying to root the tops after rotting the bottoms. sigh!
I wouldn't soak these fickle seeds for more than an hour. Or maybe a half hour. Sponge plants!