Philip Larkin interview excerpt in Paris Review (Issue 84, Summer 1982):
Yes, I was afraid you’d ask about writing. Anything I say about writing poems is bound to be retrospective, because in fact I’ve written very little since moving into this house, or since High Windows, or since 1974, whichever way you like to put it. But when I did write them, well, it was in the evenings, after work, after washing up (I’m sorry: you would call this “doing the dishes”). It was a routine like any other. And really it worked very well: I don’t think you can write a poem for more than two hours. After that you’re going round in circles, and it’s much better to leave it for twenty-four hours, by which time your subconscious or whatever has solved the block and you’re ready to go on.
The best writing conditions I ever had were in Belfast, when I was working at the University there. Another top-floor flat, by the way. I wrote between eight and ten in the evenings, then went to the University bar till eleven, then played cards or talked with friends till one or two. The first part of the evening had the second part to look forward to, and I could enjoy the second part with a clear conscience because I’d done my two hours. I can’t seem to organize that now.