This compact clock is set to about 29 minutes:
There is a /say block and some note blocks to let you know.
Set this from: "fast to 22.76 hours" with more go to "years"
see see "CodeCrafted" video for seting time and All the info:
Credits:
"CodeCrafted" https://www.youtube.com/watch?v=-MGNWAXIKoU
"EthosLab" https://www.youtube.com/watch?v=bYwzd62cLSw
CREATIONS
MINECRAFT-SCHEMATICS.COM