Does the mention of "the hour of prayer" in Acts 3:1 suggest that Christians are to pray at a specific time?:
Act 3:1 Now Peter and John went up together into the temple at the hour of prayer, being the ninth hour.
Acts 3:1 refers to the hour of prayer in the Jewish temple which was set at the 9th hour (IE: 3pm). Because of this precedent many Christian groups set an hour of prayer:
However, the NT does not establish any such scheduled activities as a matter of "law" or required tradition.