For a service technician you can expect to train for about a month. You will study for your government certification in this time, and assuming you pass you will likely start on your own in the next month. However, training is always ongoing even though you will be capable of working on your own after a month, expect more training over the next few months.
Training is 2 weeks
Office training/studying for the pesticide applicator license, 2 weeks or so, field training varies, but 2 weeks is regular.
You could be on the road in about a month, it all depends how long it takes you to pass the pesticide applicator license test. If you already have one you probably have experience and in a week you'll be working.