Looks like Smart is now dropping the "unli" word as Smart Unlisurf will be replaced soon by the upcoming Smart Bro Surf Max.
Starting October 31, 2015 to April 30, 2016, you have to learn these keywords and validity if you need to go all-day surfing for your mobile devices or pocket WiFi. Yes, they are now using the "all day" term and it is available from 24 hours up to 30 days.
Based on their FAQs section found on their website, you can do simple social media browsing down to downloading and uploading some stuff.
Users will be notified an hour via SMS on the expiration of their registered promo. It is not clear yet on the minimum load balance but expect an update regarding on that thing.