Whats your opinion on training a muscle group twice a week..?

[Izover4u]

Just wondering what you guys think of training a certain muscle group twice a week... I am on week 2 of my 10 week cycle... heres my split

Sunday(shoot)- shoulders
Monday-Legs
Tuesday-Chest
Wed- off
Thursday(shoot)- back
Friday- Chest
Sat-arms

I just dont want to over train ect ect... This first week i took friday off because my chest was still sore from tues... As a role of thumb is it ok to say once your not sore anymore its ok to hit that body part for a second time during the week?

Your opinions would be great...
thanks <img src="http://www.massmonsters.com/infopop/emoticons/icon_smile.gif" alt="Smile" width="15" height="15"><!--graemlin:-->