Most pilots believed that if you missed a full position report that within 2 minutes they would start a search.
Communication checks started 3 minutes after the estimated time at a position. A SAR phase is declared 15 mins after the estimate.
I am amazed even today the number of pilots who put in a Sar watch with AsA rather than a family friend or business associate.
I know who is most likely to be concerned if given the responsibility. And it’s not the Airservices computer system!
Which of the two systems is more likely to forget or suddenly remember 1 or 2 hours later.