How many times can I upload a program or sketch to my Arduino Uno Clone Board?
He's talking complete and utter gibberish.  To quote from the ATMega328P datasheet:


  
  High Endurance Non-volatile Memory Segments
  
  
  32KBytes of In-System Self-Programmable Flash program
  Memory
  1KBytes EEPROM
  2KBytes Internal SRAM
  Write/Erase Cycles: 10,000 Flash/100,000 EEPROM
  Data Retention: 20 years at 85°C/100 years at 25°C(1)
  Optional Boot Code Section with Independent Lock Bits
  
  
  In-System Programming by On-chip Boot Program
  True Read-While-Write Operation
  
  Programming Lock for Software Security
  
  


So you have at least 10,000 uses out of it before it starts to go flakey.