Aha...yes it"s true. But I myself believe that it"s my flaw to put much time in writing an email even a simple one! Honestly, I do my best to write is discreetly, and avoid making Spelling or Grammar mistakes as much as I can. So, I were much fluent, It wouldn"t take that much time.
To wrap it up, to my point of view, it"s not really time consuming, because I contact people who are really busy and reply my email immediately in details! it"s always amazing how they write...