WSO2 ESB 5.0.0 - maximum traffic it can hold

Question

I am trying to analyse what will be the maximum traffic can wso2 ESB 5.0.0 can take or hold in a Production environment.

1. Like how many API's we can deploy in two servers in a cluster with 2 WSO2 MB?
2. What will be the maximum number of calls each API or the overall API's can take per minute?

We have 2 ESB and 2 MB servers running in a cluster. ESB: 16 GB RAM 100GB HD MB: 4 GB RAm 100GB HD

Any information will be helpful.