Suppose you are a coroner. A murder victim comes in at a stage of rigor mortis.

Suppose you are a coroner. A murder victim comes in at a stage of rigor mortis. The detectives involved bring in the victims' medical file, and you discover they have a mitochondrial disorder that results in lower levels of ATP than normal. How will this affect when rigor mortis would set in? Would it affect how long rigor mortis lasts?