Your Travel eSIM validity starts upon activation at your destination.
For example, if you activate a 7-day 1GB package on 1 March, you'll be able to use the 1GB of data from 1–7 March.
Once your data runs out, your connection will stop.
To stay connected, just top up with a new data package, and you can do that here: https://visit.tngdigital.com.my/travelesim.