Typically most companies use the whole 45 days to review but it is not the rule. Here is a company that filed only a couple days after annoucing their PEA:

http://www.marketwire.com/press-release/bacanora-announces-filing-preliminary-economic-assessment-on-el-cajon-borate-deposit-tsx-venture-bcn-1743635.htm

Once filed on SEDAR it should be available on SEDAR's website the next day or instantly to people with certain newsfeeds (e.g. Bloomberg, ThomsonOne...).