If you have been "asked" to take on 2 day jobs, you always have the option to say "no, thank you " to one of them. My recommendation is to manage your projects and not your "jobs". Clearly identify the tasks, priority of the tasks, the deadlines and stakeholders for your tasks and projects. Then schedule your time appropriately according to the priorities. Be transparent with your managers on what you can realistically deliver, and at what quality. If the success is important to your manager, they will be realistic on what can be delivered.
I have several self-study courses on time management and realistic scheduling. Check them out at www.lauraleerose.com/ecourses .