Ending particle production

After you’ve started the explosion, you should have three keys. In the frame you want the explosion to end, (93 in my case) set another key for 6,000 and set it to 0 in the next frame to make sure the particle production stops abruptly. You can also make the Emitter smaller or bigger to control the size of the explosion. This won’t affect the velocity of the particles, just the timeframe in which they begin, continue exploding, and abruptly stop.