To answer the original poster, depends on a lot of things, but on average 3-6 months! But at the end of the day a pump is only as good as the user...
@ Jacqueline
It's difficult to say, pretty individual I get a couple of mild ones a month!
The pump can help to reduce hypo's has it can create a more flat basal profile to work from, and the basal profile is the kingpin to control..
But also, due to features like the TBR (Temp Basal Rate) you can turn the pump down for different activities ect that with injections might bring on a hypo or if BG's are dropping to avoid a hypo... Also turn it up as well to avoid going high..
All pumps come with 3 different bolus deliveries...
A standard, dose all at one go (just like a injection)
A extended wave, where you program the pump to deliver over a period of time, starting from 15 minutes and increases of 15 minutes..
A Multiwave, where the dose is split into two, first part is delivered at one, the rest is delivered over a programmed period of time
And the good thing about the bolus's settings is that if little one doesn't eat what you think he's going to eat then you can cancel them out, or use the TBR feature to curtail the amount of insulin being delivered... Another good feature if they decide to eat more than you programmed in, then a couple of button presses is all it needs to give a little more insulin..
And as pumps can deliver 0.005 upwards... Lot easier to deliver just the right amount of insulin..
Don't worry if the above sounds complicated, you can start of with basic functions, and bring in the advanced functions in when you'll ready..
Pumps are good with children as the parent can use them both in a pro-active management way, but also quick as a flash use them in a reactive management.. Which is handy when kids throw a growth spurt, hunger strike, decided to become friends with the latest bug going around ect...