How do I extend the TNT countdown in Minecraft?

Ne
- in Mods
1

Would like to build a kind of time bomb and for that I would have to use a command to extend the time in which the TnT flashes white.

If someone knows a good mod with a time bomb for 1.7.10, I will also accept it.

St

You can extend the ignition trace and extend the ticks with repeaters, why don't you do that?