I tend to work daytime, M-F, and occasional weekends where needed. My hours are fairly flexible. Depending on the project scope, I may work late into the night if necessary.
As for payment, if a project is done within a week, I prefer to be paid shortly after completion. I expect spend time with my client via phone or text and brief him or her on what work was done and train the client if necessary. Once everyone is happy, I will invoice for immediate payment for my services.
If the project spans more than one week, I prefer to be paid regularly for my hours every week, with the pay date depending on the start date of the contract.