Depending on how you vape, you can mix about 30 mils of finished product to test. Likely, no matter what, it will be vapeable. I drip in an RDA, so for me 30 mils is a days consumption of juice. if you only use a mil or two a day, then maybe 5 mils is plenty.
Just make sure your test batch is big enough you can vape some today, and you can come back to it later if you need to let it sit on the shelf for a while.
Creams tend to need a little aging time, to be prime. The general rule of thumb is creams and tobaccos need aging time. so keep that in mind when you mix.
Ah ok, 30 mls would be good because I go through about 10 or 15 mls/ day. I use an Ijust 2 and a subox mini setup that sucks my juice like crazy lol. I'm a chain vaper actually.
Will be using creams alot because I love them as advs, so I'll make enough to allow for steepage.