Doing a very long hike with the Garmin Fenix 5

Hey guys,

this december, im going up the mount kilimanjaro. The hike will take 8 days for up and down.
Now to the question: The Garmin has a function that you can hold an activity. So can you load the watch in the time when you hold an activity for many days?

Or for how many days do you can hold the activity when you are loading your watch?