As far as I understand, a kalpa is 4.32 billion years long. In that time, the universe is destroyed and created anew. In a video from Extra Mythology, they state:
"It is told that the universe regenerates in cycles of every 2.16 billion years and at the end of each cycle, Shiva destroys it."
2.16 billion years is exactly half a kalpa. Is there any specific reason they chose half a kalpa here? Are they wrong or am I missing something?