'Datagroup Maintenance Schedule' vs. 'datagroup- max_cache_age'

[priyanath]

if I have defined max_cache_age in datagroup within a model say 'A' and we also have Datagroup Maintenance Schedule then which one should be executing for this model?

here is a code

datagroup: caching_dashboard {
max_cache_age: "720 hours"
label: "Market Cache Policy"
}

then, I also have this 

Will Looker runs the caching policy per 'datagroup defined in the model ' or per 'Datagroup Maintenance Schedule' for this model A.  Thank you