yes for ur answer, but its actually follow credit validity.

not sure about uni5g, but old unifi mobile, validity is 95 days.
i last topup rm30 on 29 march valid till 2 sept (96 days?).

hotlink pantas prepaid also got data that follow expiry.
if u buy 365 days for rm30,
then when u buy 5gb for rm10 / 2gb for rm4 it will valid for 365 days.