I have looked around the internet for methods of having big redstone delays (Up to 5 or 7 minutes), and multiple of these delays in a row, each delay sending a redstone signal to a command block then activating another long redstone delay (Not a loop).
The problem is that I don't want to use a whole lot of repeaters connected between different command blocks, as this would take too long and take up a lot of space. The amount of time also does not need to be too accurate.
What I have found is that many of the solutions I have tried to find are loops (Like Etho's Hopper Timer), and instead of a constant loop I want a redstone delay, like a bunch of repeaters, but more compact.
Anything easy to set up via redstone is preferred but I'm open to using scoreboards.
Edit: I slightly edited Yeet's suggestion so that the command kills the minecart, sand, and also gives an output.