Most of the time, I can write anywhere. I can tune out the background noise or I plug in my ear buds. But, write anytime? Somehow that's harder.
I have times of the day when my mind flickers like a burning-out lightbulb. I feel it start about 3:30pm. Sometimes I get a surge at 7:00pm and then I can keep going until 8:30 or so. By 9:00pm, I'm out! That's true for more than writing. I've found myself go into shut-down mode as soon as that hour begins.
I find that my best writing hours are from 9am to 11am and from 1:00 to 3:00pm. Even so, a solid two-hour stint doesn't always happen. I need to refuel or pay attention to the dogs and cat or answer a question from one of the kids or stop before the next activity begins. (When I started writing this post, it was just before my Bible study. I had to stash my phone away mid-sentence so that I could greet one of my friends.)
But, here is the point. Write. Set that two-hour block aside (and maybe a second two-hour block), but write. Take five minutes to sketch out a blog post. Type or write the one word that begins the poem or summarizes a story. Stop everything and write something. Even if later, you wonder what you meant by that. Then write what it means to you right this minute.
Just write. Anytime!