How many times can Filipinos enter Hongkong?

Hi, I understand that Filipinos enjoy free entry for up to 14 days in Hongkong as tourists. But how does HK immigration count 14 days? If I visit Hongkong for the same year, for let's say 10 days, then I visit again a month later, does that mean I only have 4 days left to use? I'm asking because I have friend based in Hong Kong and would like to visit him more often, like once or twice every six months. Thank you.