With laser printers like the HP Color LaserJet Pro M479fdw, colours are less likely to dry out, unlike inkjet printers. Here are some reasons why this is not a major problem:

- Laser printers use toner, which is in solid form, not liquid form like ink. Toner does not dry out when the printer is not in use.
- The colour toners in laser printers remain stable over long periods of time and retain their print quality as long as they are stored and used properly.

However, there are some potential problems that can occur if the printer is not used for a long period of time, such as dust build-up in the laser unit, which can affect print quality. However, these can be remedied by cleaning the printer.

Overall, it should not be a problem if you do not print in colour for 2 months.