When making adventure-maps any time you want to have dialog you have to place a command block and then create a string of maxed-out repeaters and then another command block then more repeaters and so on. What if there were customizable repeaters a little like command blocks which would have a GUI in which you could specify not only the delay of the repeater but also how many blocks the output signal would travel.
To get by this, you could use repeating command blocks, and scoreboard objectives.
A. I was making a suggestion not asking for redstone help (but thanks anyway).
B. Many people (me included) have no idea what "scroreboard objectives" are and if you're making something without command blocks for one reason or another this would come in handy.
There are more modern ways to making long delays that don't require incredible numbers of repeaters. With vanilla repeaters you can make things like hopper clocks, comparator fader clocks and item despawn timers.