I’m very boring.
Basically I mix and leave it alone for two weeks in a draw, shaking it once a day if I remember.
I try to use fruity flavours first, followed by tobacco and then bakeries.
I’ve certainly tried a concentrate or recipe and initially not liked it but not dumped it. I’ve often found that when I return to it weeks or even months later the taste has improved.
My rule of thumb is don’t sample anything before two weeks but don’t dump it if I don’t like it straight off the bat.