Peter responded quite quickly to all the calls (usually within an hour).
With regard to the work: again: everything was done quite quickly: I looked at the project. He found / showed problem places for part of the bugs. For the other part (which requires longer time costs, including refactoring code and changing the application logic) made recommendations, implementation plan and even estimates of time costs. In fact, in a few hours, we got out of the source of problems that we couldn’t find / curate for 2 weeks.