I apologise if this post only tells you what you already know, but the CICA website can be a bit tricky to navigate, so I thought you might have missed these:
Firstly, regarding the time scale:
"Currently, reaching a final decision on your claim can usually take a year or more depending on the complexity of your case. More straightforward cases, for instance where you have largely recovered from your injuries and all police enquiries have been completed, will usually be resolved in a much shorter timescale. However, more complex cases, for example where you are still receiving medical treatment, can take longer. Where appropriate in these cases, we will look to make an interim payment as soon as we can"
More importantly, there's an online calculator available which helps you to estimate the likely payment:
http://tinyurl.com/5hcyc7
Chris