I allready answered your mail, you will get replacement from us.
Best time would be 100 seconds but problem is that we were unable to find such a timer. Available was only 90 and 120 seconds. We chose 90 seconds but in first print run there were big differences between timers. In second print run we tried to resolve this issue and they should be 90 seconds +/- 10 seconds.
Just saw your mail today Petr. Really pleased that you can send me a replacement. Thanks!