Yes, all four public toilets listed in Bukit Panjang are open 24 hours daily. This is a significant advantage for those needing restroom facilities at any time of the day or night. The Zhenghua Nature Park Toilet, the 'Public Toilet & Water Cooler' (Segar Rd), the 'Public Toilet' (Jelebu Rd), and the 'Public Toilet & Water Cooler' (Hindhede Dr) all boast 24/7 accessibility. However, please be aware that while they are open, the condition and cleanliness can vary, as indicated by the reviews. The Jelebu Road toilet, in particular, has a very low rating, suggesting potential issues despite its 24-hour availability.