No Chemistry Just Practical What Works, What Don't
Do not worry about the chemistry; as a practical matter certain combinations cannot be mixed together.
It does not matter how long you wait, whether you heat it or not.
Simply stated you cannot mix Calcium chloride and Epsom salt together in concentrations meant for dosing.
As a practical matter to raise the GH (general hardness) of RO (reverse osmosis) water in a large container mix the Epsom salts, thoroughly, then add the Calcium chloride a little at a time mixing as you go.
Do you mind sharing how much RO water, Epsom salt, Calcium chloride (do you know the hydrate?) you are adding, and what level of GH you are trying to reach.
If your Guru tells you otherwise and you are true believer that is okay I will not argue the point.
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I pretty much limit what I say to things that anyone can easily verify from recognized references or by direct observation. If it is my opinion I say so.