Can someone give me an estimate of how long a black moor goldfish would live in bowl?

It's not recommended to keep a black moor goldfish in a bowl. Here's why:

* Bowl size: Bowls are simply too small for goldfish. Goldfish need ample space to swim and thrive.

* Water quality: Small bowls have a very limited water volume, which makes it difficult to maintain stable water parameters. Goldfish produce a lot of waste, and poor water quality leads to health problems and a shortened lifespan.

* Black moor's needs: Black moors are a fancy goldfish variety with specific needs. Their bulbous eyes and delicate fins are prone to damage in small spaces with limited water circulation.

Instead of a bowl, consider a tank:

* Minimum size: For a single black moor, a 20-gallon tank is the absolute minimum.

* Larger is better: Ideally, a larger tank (40 gallons or more) is best for their health and well-being.

Lifespan:

* In ideal conditions, a well-cared-for black moor goldfish can live for 10-15 years or even longer.

* In a bowl, their lifespan will be drastically reduced.

Please remember, keeping a fish in a bowl is cruel and harmful. It's essential to provide them with the space and environment they need to live a healthy and fulfilling life.