I am similarly disappointed with this week's, it only took me exactly half of the recommended time (i.e. 29 minutes) and I wasn't going at it very hard - I could easily have got it under 25 minutes.
I'm pretty sure 58 minutes wasn't the recommended time that the Japanese creators set, and I'm equally as sure that The Times only put this as the recommended time to encourage beginners that their time of 2 hours isn't so bad after all, and therefore get them buying the Saturday Times every week (which is £1.10) so that they can improve.
The abilities of the users of this forum are not representative of the abilities of the other 50,000 people who buy the times every day, and so by putting a long recommended time they appeal to the Lowest Common Denominator, which is probably a sound business strategy.
Unfortunately they have probably made the Samurais easier for the same reason, which is annoying for us, but I'm afraid we'll probably have to get used to it. Also, you may have noticed that they have stopped asking for people to send in the time it took them to solve it. This is probably because they got lots of entries saying 2 hours for a '43 minute' puzzle, and have decided to, as demdempster nicely puts it:
go down the road of pretending its puzzles are getting harder whilst simultaneously making them easier.
Does anyone agree with me?
George