so from what has been said, would you all think that it takes about 3 to 7 days for a muscle to be completely re-built/healed again?
sometimes longer... and people should never judge healing based on soreness. your muscles are still healing even when they are not sore. I find I'm always changing up my routine, trying to find out what's best for me.
Right now mine looks like this:
Back > lats / mid to lower back/ clean'n'press, several lat excercises, cable pulldowns (behind head and infront of chest), deadlifts, etc. This is a heavy compound day.
day off
Chest > flat bench, incline incline and more incline (BB and DB), decline db or bb, seated machine press
day off (but not always day off, I alternate)
Bi's/tri's > for bi's > BB, preacher curl, preacher db, drop set cable curls and/or standing curls. for Tri's > Skull crushers, drop set cable pulldowns, flatbench BB (close-grip)
Shoulders > clean n press / military press / traps / upper back / and then some isolation. another heavy compound day.
Legs > this usually always changes but consists of squats first, maybe some romanian deadlifts then isolation excercises after.
2 days off
repeat
I'm going to combine shoulders and legs this week though, although it may be a bit much in one day.
I also never do shoulders early in the week or my performance declines on other days/groups following it. I used to do shoulders before chest day, and that was a huge mistake. My rotator cuff would kill me during chest excercises.
Calves + abs I work everyother day, started this routine lately.
You also have to realize that compound lifts can really work other groups that you don't expect..for example if you lock out your clean and press, you're working your tris a lot too.
I'm mostly a noob though and still learning my own body and that routine above will likely change a few more times. Everyone's different.