With current light-element abundances, hadronic decays of long-lived particles are excluded above a yield curve in lifetime, and for gravitinos this translates into reheating temperature upper limits as low as 5×10^5 GeV.
Kolb, The Early Universe
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Updated BBN Bounds on Hadronic Injection in the Early Universe: The Gravitino Problem
With current light-element abundances, hadronic decays of long-lived particles are excluded above a yield curve in lifetime, and for gravitinos this translates into reheating temperature upper limits as low as 5×10^5 GeV.