Personally, I've never had a yeast take longer than 48 hours and even that is rare, normally some activity is happening within 24. However, some people have gone as long as 72 hours before something started happening. I'm assuming you don't see any krausen forming yet. However, CO2 pressure building in the bucket seems to indicate it's doing something. Could be it will take off at any point now. I always have an extra packet or two of dry yeast on hand, just in case there is an issue, but that doesn't do you much good at this point.
Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience. - C. S. Lewis, English essayist & juvenile novelist (1898 - 1963)