YES definitely. We had this exact same issue with my son starting at 3. We started using a timer with him at 4 and we are still using the same little kitchen timer at 9. My son gets 20-30 minutes of recreational computer/wii/gameboy time a day. I think we started with 15 minutes. He might have gotten 10-20 minutes more if he was doing something educational (reading, math games) We have had to have some dry runs with NO recreational technology. I've found if we set a rule and live by it (like using the timer), it becomes ingrained pretty quickly.
