Depends on whether you are buying with CASH (as fast as seller is ready) or a LOAN (30-45 days) . Also, if the building has any issues that will become apparent via the condo questionnaire then the sellers may be the reason fro the delay.
If you need to get a loan then it usually takes 30-40 days to get the loan and you can close a few days after that. It's the same for a house/2 flat. Whatever it takes the lender to do their work. On a cash deal it can be 10-14 days if the condo association gets you all the paperwork on time.
In theory it should be 30 - 45 days but there are so many variables such as how responsive the property manager is to requests, what issues come up, how picky the lender is, how fast YOU respond to documentation requests. A really complicated deal can stretch to 3 months (not typical).
I agree with Lynn, You are looking at a 30 to 45 day turn around if you are using a lender. Some major lenders have longer waiting times due to their structure. If you are using cash and it is not a distressed sale then you can close within a week. Good luck!!