Back in 2011, I remembered that postpaid subscribers of unli surf are given only 1GB daily bandwidth cap as part of Globe's fair use policy. But eventually, no data cap was implemented in the recent years. You'll just notice that your internet speed is getting slower and slower especially if you're downloading via torrent. But it'll refresh in the morning, and you can resume your download.
If you're on unlisurf plan 999 (postpaid), don't worry about being "shocked" when you receive your bill. hehe. Globe will not charge you additional regardless of how many GB you've already consumed.