Climbed Murchison on July 15, 2017 with Jason. Excellent conditions; dry rock with snow patches in ideal locations (i.e. gulleys) for quick travel. It took us approx 3.5hrs to the bivi location, another 3.5hrs to the summit, then about 5hrs down (i.e. overall 12hrs car-car). There is plenty of loose rock and scree, so bring poles and be cautious when pulling on hand holds. Facebook post
Key beta for the summit block... after a bit of easy up/over small buttresses on the ridge you come to a larger (20m ish) wall where its best to continue around to the right on ledges (and small snow patches) until you find a corner with a large (10 foot) chockstone. For our ascent there was snow/ice in the lower part below the chockstone that may easy travel up behind the chockstone (wide stem) to gain the next ledge. From there we went about 10m left to more easy scrambling up another corner to gain the summit directly.
We reversed our path and did 1 rap (22m) off a large block (slings and rap ring placed) to just below the chockstone. From there its easy to reverse your path back along the ridge to the col, and easy scree descent back to the trailhead.
We brought crampons, ice axe, a 45m rope, and small rock rack -- but didn't use any rock gear. If you use the beta above you probably only need a 45-50m rope, rap materials, crampons, and ice axe.