It sounds like you're excited about the upcoming Bitcoin halving event!

To break it down for you:

* The current block height is indeed around 2.5 million blocks (as of my knowledge cutoff).

* There are approximately 6.9 trillion blocks in a Bitcoin block reward schedule (assuming the current block time and difficulty adjustment parameters remain constant).

* So, to calculate how many blocks are left until the halving event:

6,900,000,000 / 2,500,000 ≈ 2,760 blocks per halving cycle

* Since there's approximately one halving event every 4 years (as of my knowledge cutoff), this means we're currently around 3-4 years away from the next halving event.

However, please note that:

1. The actual number of blocks remaining might vary depending on network conditions and adjustments to the protocol.

2. Bitcoin's block time can fluctuate over time due to factors like changes in global network usage or mining power.

3. The exact date of the next halving event is subject to the release schedule, which might be influenced by future upgrades or modifications to the protocol.

Keep in mind that predicting exact timelines is challenging, and actual dates may differ from what we're currently estimating.

If you have any specific questions about Bitcoin or its development, feel free to ask!