Short and Christmas, Volume 2 by Valerie Floeter  contains miniature sacred solos, each about a minute long,  perfect for Christmas worship occasions.  There are many occasions when a piece of less than a minute fits the requirement. Short and Christmas, Volume 2 contains the following titles –

A Great and Mighty Wonder (ES IST EIN ROS)
Away in a Manger (CRADLE SONG)
Gentle Mary Laid Her Child (TEMPUS ADEST FLORIDUM)
Hark! The Herald Angels Sing MENDELSSOHN
Joy to the World (ANTIOCH)
Let Us All with Gladsome Voice (LASST UNS ALLE)
Now Praise We Christ, the Holy One (CHRISTUM WIR SOLLEN LOBEN SCHON)
O Little Town of Bethlehem (ST. LOUIS)
Once Again My Heart Rejoices (FROHLICH SOLL MEIN HERZE SPRINGEN)
Of the Father’s Love Begotten (DIVINUM MYSTERIUM)
Silent Night! Holy Night (STILLE NACHT)
To Shepherds as They Watched by Night (PUER NOBIS NASCITUR)
What Child Is This (GREENSLEEVES)
While By the Sleep (JUNGST)

Sample     Video