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It depends on what people infer from the word prayer.
Prayers can be requests from the heart to the Almighty. It can be small please for help when all is lost and man needs help really badly or else it can be requests for a better lifestyle or just about any need in particular.
By prayers, some people would actually think it refers to chanting like chanting mantras repeatedly. The Hare Krishna Maha Mantra is chanted for sixteen rounds per day by staunch devotees of ISKCON.
Prayers can be repeated if it is simple enough for you to do so. I have heard people reciting long scriptures repeatedly but and this is a mighty but one should not just repeat prayers like a parrot. It is of no use if the prayers do not arise from the heart.