Set time to write or stop to write as inspiration hits?

Since I don't have a whole lot of time to write, I have to write at a set time mostly. I am involved in a writing group. We meet weekly and it seems to be the only time I can find to write. Unless I have a creative flow and just have to write, then I don't write outside my set time. I have been pretty dry lately. Since I am editing more than anything right now, I should give myself a set time to do this but I really have to be in the mood. Editing is a little boring. I need some motivation. I have an all day writing retreat tomorrow so hopefully my muse will find me and get my pen flowing.

I've tried setting scheduled writing times and I've only be able to stick to a schedule for a couple of days. I didn't write based on time, I wrote based on the amount of pieces I wanted to write each day. I was able to write quite a few pieces by thinking about it that way. I think putting a time limit on writing is too restrictive, and basing it on the number of pieces I want to churn our a day means I can sit down whenever the mood stricks and write.

I am a haphazard writer, usually writing when I feel like it, instead of when I should. When I force myself to sit down and write I can do it. Often inspiration comes just from the process, which tells me that I need to have more of a set schedule for it and I would probably be a lot more successful in my writing. Great question. I rely too much on inspiration and need to focus on the perspiration (hard work) of writing.