mixture becoming homogeneous, how long of a wait?

[tmalew2]

Does anyone know how long would you have to wait for a mixture to become homogeneous. I would be making mixture of 305 ml, about 100ppm of a hydrocarbon and 20 psi of Helium.

How long would you have to wait for the mixture to become homogeneous?

normally I waited 15 minutes, is that to short or 5 min would do it?

[AICMM]

tmalew2,

What are you doing to mix it?

Best regards.

[tmalew2]

nothing is done to mix it, we wait with time for the mixture to become homogeneous. How much time should you give to for a 0.305 liter vessel. The mixture contains few hydrocarbons in ppm levels and 20 psi of helium.