If you will be away and need to put your store in Time Away mode, follow these steps from eBay's Time Away guide.
Go to My eBay > Account settings > Time Away settings.
Select Schedule Time Away
Select Allow item sales or Pause item sales while on Time Away
Set a Start date and an End date for your Time Away
Select Apply
For more details please visit eBay's page for managing your eBay store here: Managing your eBay store
Thing to remember
Only fixed priced listings will be hidden. Auction Items will remain active
It will take a few days for your Fixed Priced Items to Hide when Activating vacation mode, and Show when Disabling vacation mode
Your Time Away will begin at 12:01am on your scheduled start date and finish at 11:59pm on your scheduled end date
If you allow item sales, your time away can last up to 15 days
If you pause item sales, your time away can last up to 30 days