Short answer: At $500/week: ~1 year for 5% deposit. At $200/week: ~2.5 years.
It depends on your income, spending, and how much you save each week. If you save $500 per week, you need 60 weeks to save $30,000 (5% of a $600,000 house). If you save $200 per week, it takes 2.5 years. Use a calculator with your real numbers.
Target Deposit: $30,000
Save500 Per Week: 60 weeks (1.2 years)
Save300 Per Week: 100 weeks (1.9 years)
Save200 Per Week: 150 weeks (2.9 years)