There’s a theoretical limit of 9999, the valid range of cm’s is between 0002 and 9998. 0001 is for testing

9999 Íͯ̑s̮ f͡orͣͯ ť̙͇ra͌ͬͅn͕͋͒sc̲͡e͋͡n̼d̳in̸̟ͦg̥̙ͮ t̟͎̤he͡ͅ ì̸̵ͣͫn̲͍̓ͮ̇t͓̱̺̀ͪͨ̍̄ͩ͘è̦͡r̴̫̺͇̞͇̀ͅḍ̀̓͜͠iͦm̨̍̏̋̔̈̿̆e̝̞̗̎̓ͧ̀͌̍͢n̶̺͜s̟̲̀ͮ̍̎ͥ͘͟͜i̴̫̜͉̿̈̽́̃o̞͉ͨͨ̌͛ͭͩ͒ͯ͡n͎͉͈̣͍̖̉͜a̢_͈͍̥ͣ͂͊̇͘l p̯̏̏ͪl̶̨̐̿̍a̪̻̬̬̽ͮne̖ f̡͓̞̮͙̲̳͌̍͑̒͂͝o̯̯̪̤ͩͭ͗ͨr̥̯͐͡_̵̥̩̐̄ ho̶̧̙̬̫̊̃ͪͧ̕͜͡r̶̢̟̼̻͍̮̬͍̺̉ͯͥ̊̓̍̋ͥ͝r̩̹̰̬̠ͭ̈́̊or̷̡͔̘̲̟̋̈́̃ͭͤͤ̄s̛̻̗̹ͮ be̵̡̯̜̘̻̬̩̰ͥ̉̊ͧͫ̏͒ͤ̄y̵̸ͩ͗̇ͩo̸̵̮͍̻͕̞͊ͣ́ͦ͟͟n̲̣ͣ̚d̤̩͖̜͓͛ͭ̃̌̅̆̓̃̈́͟͟͝ h̴͕̥̫͊ͥ̋̏̓̃̾̕͜u̡̓̆_̷̷̢̬͕̪̬̻͓̑̒̇͗͘m̈́a̠ͯn̷̷̢̥͍̹ͥͮ͛̽̕͘ c͔̞͈̗̜̔̋̾̂͑́om̸̭̖̾͂̆̍͂pr͓̍_̭̺̥͙̌͑̈́̚e̷̷̺_̠̟̌ͅh̵̢͎͐̎͢eͥ̏͂ͭ̏n̛͉̞̭̖̮͉̹͕̜̽ͯ͂̔̅̓̀͜s̶̙̬͉̍͛͑̎̒͒͢͢͠i̴̇̄̊̇̐̓ͮ̔̕͜o̘͑ň͙̱̟̤̿̔̾͠.̟̠̗̘͙ͩ̓̑̋͜͟