You're not a native English speaker?? I would have NEVER guessed. You write so well!
As for the 60 minutes or less, those blogs would probably be around 350 words with 1-2 pictures. Anything more than that "ups" the time. I find that (even when I shoot for a shorter length) my articles usually end up around 1,000-2,000+ words. Those take more like 3-4 hours :P
Nope, Dutch is my mother tongue! Thanks for the compliment ;) I usually try to stay below 1,000 words since we are all busy people I have noticed that when articles are too long people don't read them. I prefer to break longer articles up in part I and II. Take care and have a great weekend ;)