I tried to set up a timer for 10 mints by saying set timer for 10 mins and all I get is just a web search results. I thought these commands are basic ones. I hope Microsoft implements this soon.
I just tried this command on my 950 with the most recent production build ... and using Hey Cortana. It works on my device so it has been implemented. I have no answers for why Cortana brings up web search results for some things that seem simple and basic.