How Much Stretching?

Up early to rubber ball tightness in chest and shoulder.  Stretched out and went to gym for chest session.  Tightness always feels better after doing this and bench press definitely more comfortable but how much stretching have I got to do to resolve the problem?

Carried out some machine crunches and machine obliques for abdominal work and then felt fatigued until 2pm.

Back work in afternoon and lifted 10kg more on deadlift by mistake!  Worked chest with rubber balls again in the night and massaged traps on chin-up bar.