In The Long Earth, when the bomb was about to go off in Datum Madison, people were fleeing by means of stepping.
And the stepping began.
Parents carried their children, and went back for their own old folk, and their elderly neighbours. In care homes, some bewildered senior citizens had Steppers slapped on them and were sent East or West for the first time in their lives.
This implies that seniors were handed steppers and told to go. But in the very beginning of the book, it says that steppers only worked if the user completed the assembly themselves.
How could this work? The twisting of the wire required to complete the assembly obviously required some dexterity, and it would almost certainly take longer than the less than 60 second timeframe it apparently did.