Shiva Purana
षड्दिनानि यदा रूढं द्विवर्षं च स जीवति ॥ मासानष्टौ विजानीयाद्दिनान्यष्ट च तानि तु ॥ ५२ ॥
If it respires for six days, he lives for two yean eight months and eight days. You shall know that.
english translation
SaDdinAni yadA rUDhaM dvivarSaM ca sa jIvati ॥ mAsAnaSTau vijAnIyAddinAnyaSTa ca tAni tu ॥ 52 ॥
hk transliteration by Sanscript