It's not usual for me to send submissions off until the last week they're due, or maybe the second last week. And, being an editor of a magazine, I know this is the case for most people, as I receive almost half of the total submissions in the last two weeks.
Sending stuff out so late often means I miss a whole heap of deadlines and opportunities, because I get busy with something else and don't find time to put it all together.
But in the last few weeks I have been trying to be productive and have sent some of my work out. Some of the places are even open until the end of February.
Not sure I like my chances of maintaing this as a routine, but I can be hopeful. Sometimes I'm not even sure why I tend to wait until those last days. So, feel free to drop a line letting me know whether you send stuff in early or wait until the end, and why.