It depended on how big the mosaic was and how small the pieces that were used were. Large and sophisticated mosaics built take years to make.
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The Pantheon is a Roman temple that was built by Emperor Hadrian to replace Agrippa's Pantheon. The structure took a total of 15 years to complete.
There were so many Roman emperors because the Roman empire lasted for a long, long, time.There were so many Roman emperors because the Roman empire lasted for a long, long, time.There were so many Roman emperors because the Roman empire lasted for a long, long, time.There were so many Roman emperors because the Roman empire lasted for a long, long, time.There were so many Roman emperors because the Roman empire lasted for a long, long, time.There were so many Roman emperors because the Roman empire lasted for a long, long, time.There were so many Roman emperors because the Roman empire lasted for a long, long, time.There were so many Roman emperors because the Roman empire lasted for a long, long, time.There were so many Roman emperors because the Roman empire lasted for a long, long, time.
37 years
The wall was built in about 122 AD, almost 1,900 years ago. It was built at the time of Emperor Hadrian, hence the name. It was built to protect the north of England, the furthest western part of the Roman empire] from attacks by the Scots [Picts].
The long period of peace was called the Pax Romana