SonarQube displays estimates for the amount of effort required to fix issues in various locations.
Certain types of manager instantly home in on these figures as they appear to give an easy answer to the difficult and nuanced questions.
It would be easier to have constructive conversations if SonarQube did not attempt to put a figure on the debt.
Is it possible to somehow stop SonarQube from displaying these figures?
Sorry, no. This is a core feature.
The closest you could come is with the commercial Governance plugin (to be released with 5.6) which would allow you to set the remediation cost for each rule to 0min.