There is a lot of talk about another article 50 extension in the Brexit issue. I've seen various people on both sides of the Brexit issue characterising the negotiations as a waste of time. For example, Denis de Bernardy wrote in a comment:
As a fellow continental European who is following the debate, I sincerely wish that UK politicians and the UK public would spend a lot more time living out of their bubble. The real question is not and never has been whether the PM will or will not request an extension. Rather, it is whether EU leaders will accept to extend art 50. Given how the UK has been wasting their time in the past 3 years, election or not and whether the PM asks for an extension or not, UK MPs likely will be choosing between no deal and May's deal at the last hour. It is utterly disheartening to watch UK politics.
The part about wasting time (in the comment above) and Brexit taking up time which should be spent on other issues (things to that effect were mentioned repeatedly in this week's debates in the House of Commons, and it's also been mentioned with respect to EU summits which could have been devoted to other issues).
With that in mind, I'm wondering if the EU has published material on how much the Brexit negotiations cost the EU in terms of money, manpower or time. I know Brexit negotiations have an impact in different way, including an impact on the economy. To limit the scope of this question, I'm merely interested in resources devoted to the negotiations with the UK.