What is the default timeout for Apigee Microgateway?

I have a question regarding default timeout limit for microgateway.

If a request is made through Apigee Microgateway how long is it before the Microgateway considers the request expired if no response is received? i.e. 60 or 120 seconds.

I know there is an edgemicro attribute for setting request_timeout: https://docs.apigee.com/api-platform/microgateway/2.5.x/operation-and-configuration-reference-edge-microgateway#edgemicrogatewayconfigurationreference-edgemicroattributes

However, I haven't been able to find a default value within the code for microgateway itself.

Any help on this would be appreciated.

Thanks,