Let me ask, do Hindus in general speak when they pray, out loud, in their head, or more "being"?
Hindus, if they're trained at all, speak their prayers clearly and slowly in their head, silently, while making eye contact with the murthy. There will sometimes be songs of praise, but same thing, in the head, but during the pujas , all the invoking is done by the priests aloud, although some of their prayers are in silence too.
Bowing isn't part of Hinduism. When a Buddhist comes to a Hindu temple and bows, it looks weird. Hindus prostrate, women on knees, while men lay totally flat (especially in South India). There are several types of prayers, like requests, thanking, and such. I will prostrate full out up to a dozen times at each temple visit, but that wouldn't be the norm. The norm is more likely to be twice, upon entering, and just before leaving. Hindu temples generally have one main shrine, and many side shrines.