After a facelift and neck lift how long do you recommend wearing a chin strap?

My patients undergo a dressing change on post-op day 1, and the bulkier dressing is replaced with the facial garment/chin support that you're referring to. I have my patients wear that for 1 week, being able to remove it for showers and for short periods of time during the day. Definitely wear it while sleeping. Sutures are removed at 7-10 days and the garment is discontinued. I hope that helped. 

In our practice, we recommend it for 12 hours a day for 7 days.  Each surgeon has his or her own protocol that should be followed by their patients, since surgeons' techniques and surgeries are not all the same.

After a facelift, I generally have the patient wear a chin strip from the 2nd postoperative day to the 7th postoperative day. For the first two days, I place a compressive dressing, which is removed on postop day one and replaced with a lighter dressing.  Although I have not seen much utility in the use of a strap beyond a week, some patients feel more comfortable wearing it at night for several weeks.  This protocol is variable from surgeon to surgeon.