Further to my earlier reply, it surely depends what people want out of a holiday - some want a challenge, some want a leisurely cruise. 'Heartbreak Hill's' fairly tough and probably best done at the start (ie going anti-clockwise). The Audlem locks are always a pleasure to use. Not having boated for a long time, I worked out my timings in advance on the lock-mile system from the Nicholson's Guides. This suggested 20mins per lock, with an average cruising speed of 3mph, which would have meant at least 10 hour days for the 6 full days of hire. In actual fact, the locks took on average half that time, many were set for us, and everyone from the various boats helped one another in any case. The exceptions were the entrance lock to the Middlewich branch, and 2 locks on the same section, which took rather longer because of queues (they will be quieter in September). Also, because water levels were high, and dredging seems much better than a decade ago, the average speed was nearer 3.5mph (the considerable force acting against the rudder made it unpleasant to go much faster than that anyway, in answer to the person querying whether we were breaking the speed limit!). It was possible, therefore, to make very good time on early stretches like 'Heartbreak Hill', which put us well ahead, leading me to revise the timetable. The first 2 days were a little more than 10 hours each, but the next 3 were relaxed, with plenty of stops, and an average of about 7-8 hours cruising. The final day was more frantic, because of the unexpected stoppage at Gailey locks, but still only 6 hours.
To summarise, working out an efficient way of working through locks is the single most effective way to save time and energy - definitely not opening up the throttle, which can actually slow you down, and does the engine and unprotected banks no good. We found the lock-mile system (and Canalplan) to be overly-pessimistic, while the times in the Anglo-Welsh brochure were pretty spot-on - this suggests 54 hours, which can be broken down as 3-4 hours the first Saturday afternoon, 8 hours a day Sun-Fri, and 30 minutes or so on the final Saturday (from Tixall Wide to base). I would still recommend a couple of long days at the beginning to get through the tunnel and Heartbreak Hill, build up some contingency for unforeseen obstacles and allow more time to explore the villages and pubs on the Shroppie.