You can leave the deep conditioner on longer (for up to 15 minutes). This is “peak” conditioning level timing – any longer won’t benefit the hair any further. Here’s some additional tips to get the best results from the conditioner: Remove as much excess water from the hair as possible prior to applying the conditioner. You can use a plastic cap/wrap to “seal in body heat” that warms the conditioner. If available – A hot towel can be used on top of the plastic cap to provide even more warmth and conditioning penetration.