Grill each piece of chicken for about 5 minutes per side or until it reaches an internal temperature of 165°F, check using a digital meat thermometer. (I do not recommend this method for cooking bone in thighs, use the oven or the grill.)
Oven Baked Method
Preheat your oven to 375°F
Bake the marinated boneless skinless chicken thighs for 25-30 minutes, Bone in thighs usually take about 45 minutes to cook.
Sear the chicken pieces for about two to three minutes per side over the hottest part of the grill first.
You may need to move the chicken to the less hot part off the grill to finish cooking it, especially if you are using bone in thighs as they will take longer to cook than boneless skinless or pounded thin chicken breast and may burn before they are fully cooked if left over the hottest part of the grill.
Boneless skinless thighs may take about 4-5 mins per side to cook, bone in thighs can take up to 15 minutes per side.