On 21 September 2015, XPAX introduce FREE Internet Burung Hantu which provide FREE "Unlimited" High Speed Internet from 1 am to 7 am daily. There's a cap, you must subscribe to Monthly or weekly Internet plan to enjoy this benefit.  In t&c of XPAX Burung Hantu haven't mention anything about maximum quota capped and just some kind of unlimited speed and quota. On the other hand, they stated there's a cap of quota in some of the website.

Refer to malaysianwireless.com
"When asked about the Free Unlimited high speed Internet, Zalman Aefendy Zainal Abidin, Chief Marketing and Sales Officer of Celcom Axiata Berhad told MalaysianWireless that the free unlimited high speed Internet has a monthly usage cap per user, however the cap is “more than enough” for customers. "

SoyaCincau
"There apparently is also fair usage policy in regards to the data but Celcom claims that the limit is “big enough to literally surf unlimited”. This is on top of their 500MB free basic internet per month which you get as long as your subscription is active."

Theoretically, Celcom 4G LTE speed is around 10-50mbps, we can download up to 100 GB in this 6 hours time per day. If really get unlimited data per day, we can download as much as possible. I bought a Magic SIM and subscribe to monthly Internet, I will do testing for maximum download. Let's figure out tonight.


Update:
Some user downloaded 50 GB last night without quota cap
It's unlimited data now

Update 2
After downloaded 100GB, internet speed become slow

They say have here?

http://www.xpax.com.my/internet