Prayer is personal.
I cannot, according to the halacha, pray in your place. Comparing length of services reminds me of comparing, as a child, whose Passover seder lasted longer. Instead of focusing on how long or short the ideal service should be I suggest the underlying topic that is at issue is how do I make the service meaningful without becoming a burden. I want to praise G-d, THEY want to go to work. I want to go to work, THEY want to pray for the healthy recovery of the ill.