guys,
any idea how long is the validity period once i top up?

https://www.hotlink.com.my/en/plans/how-to-top-up.html
and how long is the grace period once validity period expires?
FAST Hotlink Plan gives you 50 days of Credit Grace Period. Not sure Hotlink Red Plan.
https://www.hotlink.com.my/en/tnc/hos-tnc.html

I'm asking this because i am currently working overseas, and would like to just retain my number for minimal usage.