This low rated problem took me a while

I´m trying to improve on basic tactics. So i have a set on chesstempo.com with 900 to 1250 rating, see my recent blog post http://www.chess.com/blog/Die_Schanze/dan-heismans-recommended-tactic-training-applied 

I want to solve all that stuff in less then 15 seconds each with 95 % percent success. This one has 1100 standard and i spent 55 seconds. So i have not seen the solution and had to figure it out. The ratings are sometimes low because people play the first move, take some time on the second move, and so on, instead of finding all moves to the end before they make their first move.

Please try yourself:

How long do you need?