What is the shelf life of an erythromycin lotion? erythromycin 2g Sulpho resorcinol 2g isopropanol 50g lemon spiritus 1g Hamamelis water AD 200g

Provided an overdose of 10%, the TMF assigns a shelf life of 2 months to its erythromycin lotion. It does not contain resorcine. I don't expect a big pernicious influence because of Sulpho resorcinol but nevertheless I would not exceed the 2 month.