Hi @Mahesh Pawar,
The hardcoded number limit is the size of INT in JAVA which is 2,147,483, 647.
We can't guarantee you will be able to reach this number considering other resources like DB size, disk space, artifacts storage etc.
I was able to run a test with the queries from Solved: Can I edit the Bamboo build number and I could verify that it is possible to run the build 2,147,483, 647 but not another one after that.
I think you are far away from that number.