What is the longest time to break a workout routine without loss of muscle tone? ADVERTISEMENT 311 viewsJune 10, 2015 0 Grace June 10, 2015 0 Comments 4 Answers ActiveVotedNewestOldest 0 Janet0 Posted 0 Comments I believe you start to lose strength gains in about 2 weeks. You are viewing 1 out of 4 answers, click here to view all answers. Register or Login