Worshipfully and solemnly coming before the Lord in loving adoration, confession of sins, supplication for mercy, intercession for blessings upon others, and thanksgiving for blessings received.

A prayer can be as short as asking for
one single thing, or as long as
doing all of the above.

Be careful for nothing;
but in everything by prayer and supplication with thanksgiving, let your requests be made known unto God.  And the peace of God, which passeth all understanding,  shall keep your hearts and minds through Christ Jesus.

Phillipians 4:6-7