Wa'alaikum assalam! Honestly tak semua private companies implement lagi, depends la on the company policy, a few of us dalam circle memang kena negotiate sendiri or refer balik to the HR handbook. Best way is check directly dengan HR department kamu or baca the employment contract, sebab some ada 60 days je, some generous ones bagus sampai 90 days gak. Kesian kalau assume je, better to ask properly so you know what you're entitled to!