Myofibrillar protein synthesis has been assessed up to 16 hours post-exercise and has not returned to baseline in either trained or untrained groups.

“so we think basically in untrained people it's about 48 to 72h hour response”

“The myofibrillar protein synthesis they actually don't know how long it lasts because they've only assessed it up to 16 hours post and so far neither group has return to Baseline”

“Muscle protein synthesis stays elevated for up to 24 hours after exercise.”