Choose a fast-drying rust preventive with safety first. Drying speed depends mainly on the solvent: gasoline and white spirit dry almost instantly but have low flash points and real safety risks, and a film that survives a long salt spray test needs some thickness, so it cannot also be instantly dry.
A common request
Customers who care about surface quality often ask for an oil that dries instantly and leaves no oily feel. Some also want to start a long salt spray test right after oiling.
The trade-off
Drying speed depends on the base oil and the solvent. Suppliers chasing speed may use gasoline or white spirit, which dry quickly but have low flash points. A long salt spray life also requires film thickness, which dries more slowly, so you cannot maximize both.
Compare like with like
A competing sample is only comparable if the substrate, surface treatment and protection requirement match yours. Comparisons made without those conditions are not meaningful.
Bottom line
Safety and environmental performance come first. Fast drying has real market demand, but it should never be bought at the expense of safety.