The myACP online service supports a "save draft" feature. You may save drafts at any time and come back to it later.

However, you'll need to complete your ACP and obtain consent from your Nominated Healthcare Spokespersons (NHS) within 6 months of creating your online ACP to register your ACP.

If this is not done within the 6 month window, your application will expire, and you'll need to start over.