While glycerin preservation is ideal for suppleness, if you need to dry leaves quickly:
Press between absorbent paper and heavy books for 1–3 days
Use a microwave: place leaves between paper towels and heat in 30-second bursts
Use silica gel: cover leaves in a container of silica gel for 2–3 days
Iron between wax paper on low heat
Use a flower press for 1–2 days. Remember, drying leaves quickly can make them more fragile, just like pest control solutions that are used fast can be less effective in the long run.