You'll likely only program 5-6 hours per day, unless you're super excited for the project. I'd still quote 8 because while you'd only program for 5-6 hours, you

You'll likely only program 5-6 hours per day, unless you're super excited for the project. I'd still quote 8 because while you'd only program for 5-6 hours, you still have to deal with email/phonecalls/text messages as part of your job, which are part of your work for them.