There are many reasons why someone would want a criminal or fingerprint check when apply for something such as a
UK visa - but may not necessarily be required
The OP indicated the reason (the way I read it) was it possibly for a US visa?
See the link below for some of the reasons & the possible explanations
http://www.rcmp-grc.gc.ca/cr-cj/fing-empr2-eng.htmProcessing times as follows - I would go with what the RCMP indicates as the timelines, if its better, then you benefit
http://www.rcmp-grc.gc.ca/cr-cj/time-temps-eng.htmTrust this helps the OP & others that want to know also
Disclaimer: I am not an immigration expert & anything that I post on visa & immigration is based soley on more than 30 years of personal experience & interaction with the UKBA & Home office.