I spend an hour a day even for a short 3 paragraph article with about 8 sentences total. I have to add a picture, resize, post the article, edit, re-edit. Then I'll look back later in the day and edit again.
I update my blog once a week. In terms of promoting - it's everyday. But I don't simply promote my blog. I promote my business. Traffic goes to a squeeze page, I collect leads, and I can direct them wherever I want.
Not as much as I should. I have several websites of my own, which I try and update at least once a week, but I often don't manage that, a couple usually get the posts. One of my sites there's other writers though, just the others are all me. I also get paid to blog post. I try to spend 30mins to an hour a day doing that, but I do go a day without blogging. I have the time to dedicate 2hrs a day to blog posts and which I complete them on doesn't matter. I might try a two week minimum on all my sites, with the paid ones I do a minimum of 7 per week (the days I don't do any I catch up the next day). I'm just lazy lol. One of my sites has a forum though and I'm more often on there, than anywhere else.
About 1 hour a day. It really depends. If I have much inspiration I spend more time writing posts and schedule them. Then I have some sort of buffer when I have a day without inspiration. I try to publish fresh content on my blog every day.
Usually i spend about one hour to sometimes spend more than one hour to update posting. my blog is : http://ferlinshop.blogspot.com
I m taking around 3 hour when blogging coz first i have to write things which m gonna post on blog. after writing i just give it a re read and then i post it to ma blog. it's quit interesting while you are involved in blogging.