You will never be criticized for over communicating. I am doing a refinance transaction now with a gentleman who up front that he is not a paper person and really did not want to get involved with too many details.
I took him at his word and I was wrong ! I work in an area with tons of engineers and technical workers. They are used to getting into details to a great degree -- much more than the average person and certainly much more than I am.
Years ago I was doing a loan for a gentleman who was head of sales for a large technical firm. He called to see if he could visit with me and discuss financing. He asked what he needed to bring and hearing that he was head of sales I said to just come by and we would talk to determine what we could do. The conversation continued and twice more he asked what he needed to bring -- that is not a question most sales people would ask. I asked. "Are you an Engineer?" He replied that he has an EE degree (Electrical Engineering). Then my communication changed completely....I gave him a list of items; a big list; anything and everything that I could think of and then added some more. He was happy !
I was wrong to take the gentleman's word that he is not a "paper person"...He told me the truth but we all see things so differently. For one person 'a little while" might mean 20 minutes and for another it might mean 3 hours....If you over communicate you will never be criticized.
You will never get in trouble with a client by over communicating.