I think this all really depends. Last year, I spent a million hours on my SSHRC proposal and didn't get out of the school (I was an MA student applying for PhD1) but this year, I totally changed my proposal and spent considerably less time on it and I was forwarded by my institution. Obviously, I still don't know if my application will be successful but I can say that for me personally, the more time I spent editing my SSHRC proposal, the more complicated I made it. I really benefited by having a more logical approach to SSHRC this year and realizing that spending a ton of time on it doesn't always (although it can) make a better proposal. This year, I started earlier than last year but I spent considerably less time on it. I still got it vetted by a ton of people but I feel like I was able to articulate my project much more clearly because I fought my inclination to keep tinkering with it. As with lots of things in life, input =/= output. Plus, I think SSHRC is a crap shoot anyway -- there are lots of qualified people who don't get it and lots of under-qualified people who do. I know it's really hard not to take SSHRC's decision personally but I really think a lot of it is luck and whether or not your research project is trendy. As long as it is well-written and you've gotten lots of good feedback on it, I don't think the amount of hours you spent necessarily matters. For some people, this will be a labourious project; for others, it might come a little easier because you're further ahead in your studies and have written more proposals, abstracts, etc.