I hate letting things just sit like that, tho. Once I've started, I don't stop until the yeast is pitched and the fermentation container is sealed. I have had some pretty late nights due to this, making for a pretty rough workday the next day. Cause of that, I try to do my brewing on Saturday (I rarely ever work weekends) so I can just crash sunday if my brewing session goes on longer than I expected.
Sadly, I'm busting my own rule this weekend -didn't manage to get started saturday, and now its going to have to be done sunday (technically this morning -though I need to get some shut-eye first) -got a 10gal "kitchen sink" porter batch to get through (I call it that because its a basic porter recipe, and I toss in any grains or extracts left over from previous brewing sessions -if its not in the sink, its in the porter (grin)). I've put off my brewing for two weekends now, and really need to get this stuff going. Going to be a LONG sunday. I'm doing split-batches because I wish to try some changes -like to brew one batch I know is good (tried and true) the other will have some changes that will become part of the recipe if it proves worthwhile.