What elimination half-life was reported after a 600 mg oral dose of guaifenesin, an ingredient in Benylin Chesty Coughs (Non-Drowsy), in healthy male volunteers?

Guaifenesin, an ingredient in Benylin Chesty Coughs (Non-Drowsy), had an elimination half-life of approximately 1 hour after a 600 mg oral dose in 3 healthy male volunteers.