Runners always talk about 'time on your feet' and writers need to have words on the sheet or something similar.But when you're working on a novel or some long piece, like a film script of three-act play, there can be a temptation to wait for a big block of time to get on with the writing. Don't bother starting anything unless there are hours free.
There is some logic to this - it takes a while to get back into the storyline and pick up the narration. Remembering what happened last and what needs to happen next is always tricky, even with notes and a plan and so on.
Unfortunately that means some days there is little writing done. If you've got a day job and family and any kind of hobby (isn't writing a hobby?) then big blocks of time are quite rare. So, in my case, Monday to Wednesday is often devoid of any creative writing, unless you include semi-humorous emails...
Anyway, there is a simple solution, that old warm-up technique from creative writing classes - the free-write. Although it is also a good way to break the ice for a group of uneasy CW students, it also forces the pen to paper (fingers to keyboard?) and gets the words out and engages the creative part of the brain. It can also be a good starting point for an unplanned new idea.
So next time you've got five minutes, try free-writing and see where it goes.