There is no legally required length. It is negotiated like everything else, and it should be set by what actually has to happen inside it.
Nothing in Alberta sets the length of a condition period. It is a term of your offer, negotiated the same way price and possession date are. What people mean when they say a length is “normal” is only that it is what they usually see — and what they usually see is not what your purchase needs.
One detail catches people out: a condition ordinarily expires at a specific time on a date, not at the end of that day. Read the time.
Ask for the length your slowest step needs, not the length that sounds reasonable. The condo document order is usually the answer.
Sellers prefer short. A tight condition period is one of the genuine ways to strengthen an offer without paying more, and in a competitive situation it can matter as much as a few thousand dollars. Go short only when the work is genuinely pre-arranged — broker briefed, inspector on standby, documents already ordered where that is possible.
Do not plan on an extension. An extension requires the seller to agree in writing, and a seller who now has a better offer waiting has no reason to.