There are many factors including tissue type and size. Here are recommended starting time points for select tissues using the appropriate lipid content kit:
Tissue/Organ<1 mm thick1-2 mm thick½ organWhole organ Brain1 day2-3 days7 days14 days Lung1 day1-2 days3 days7 days Kidney1 day1-2 days7-8 days15 days