24 hour urine collection?

So I have to do the 24 hour urine collection 🤦🏻‍♀️

Has anyone else had to do it? They didn’t give me any instructions so do I just pee in the jug for 24 hours and that’s it? Do I start with my first pee of the morning? I woke up at 6am to pee the woke up now at 10 would I be able to start now? If I do it today would I be able to turn it in next week or is it better to get it to them as soon as possible?