The ideal for a writer is a big block of uninterrupted time to write every day -- except when you've gone dry and have nothing you want to write about. But the time and the ideas never seem to coincide. Either you have too much of one and not enough of the other, or vice-versa.
Right now I just want to work on my as-yet-untitled dwarf novella, which is nearing the end of the first draft. But today the copyedited ms. for my December novel from Tor, Steal Across the Sky, arrived and needs attention. I have an article due next week for an academic book on writing. And student rewrites of their stories for this term are coming in.
Just wait -- as soon as I finish all this and the novella, I will have empty chunks of time and no ideas whatsoever. That's actually much worse. But that's the way it goes.