How long should I keep an ice roller in the freezer?

Most manufacturers and reviewers suggest at least 1–2 hours in the freezer before first use, after which a quick chill is enough between sessions. Cold-therapy massage balls like the Cryosphere are typically rated for several hours of usable cold after a longer freeze. Skincare specialists also caution against rolling ice directly on bare skin for too long — short passes are safer than prolonged contact.