Treating the fibrils as rod-like aggregates with lengths ranging from 100 nm to 1 µm, as seen from freeze-dried SEM imaging, the orientational relaxation time then falls within the broad range of ~10 µs to 10 ms. However, considering that the estimated relaxation time for individual polymers is ~0.1 to 1 µs and that the experimental peak relaxation times range from 60 to >100 µs from 3 to 10 mg/mL, it is likely that the flow-induced alignment and observed retardance stems primarily from alignment of the fibril aggregates in the CB solution.