I am not clear what the rule is for drinking and then davening in the following sense (can be considered a follow to https://judaism.stackexchange.com/questions/6394/drunken-davening).

On the one hand, in the SA 99 we have that someone is not allowed to daven if they have a reviit of wine (or I would assume an equivalent amount of alcohol in a different volume), and for larger volumes, we have that it depends if the person is sober enough to "speak before a king".

We also have the Mishna Berurah there on ד saying that even if one is used to drinking and feels no effects after one reviit of wine, they still may not daven.

What I don't understand is that if one feels no effects, what are they waiting for until they are allowed to pray again?

As an aside, do we use the same standard for getting an aliya in this respect (for both the oleh and the baal koreh)?