3 days. You're only limited by the cure cycles on the resins. You can place the mold or part in an elevated temp environment and accelerate the cure if you want - but there are limits. (we have a 120 degree hot room and also a couple big ovens if we need them)
1 day to surface coat and wet layup the mold off the original helmet. Cure over night.
The next day minor body work to the mold and then release the mold in prep to pull the part.
Third day layup the part and cure it over night.
Most resin are cured enough to work within 24 hours. It may take 7 - 10 days to achive full cure and strength properties.
Jim
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