How long does it take for roaches to infest a house?
It doesn’t take long for roaches to completely infest a house. It depends slightly on the type of roach, but German roaches, for example, breed very rapidly. These roaches will reproduce about every 6 weeks and will produce about 40 roaches in each egg sack. If left unchecked, you can easily have hundreds of thousands within 6 months to a year.