Ah hiding it in general wildlife eh....(usually spider questions end up in the insects forum)
I think it's around 260 years WW.
I seriously doubt they are making any dent in our insect population so I wouldn't worry. You have to remember that the warmer weather (
) which is allowing the spider to expand its habitat also has the same effect for its insect prey - some species are suffering a boost in the same way as the spider, so in the end it'll balance out.
Even though given a broad range of insect prey, spiders can become quite selective in feeding (killing and discarding prey, rather than eating them, sometimes to the point of killing 50 prey a day which is far more than a single spider can eat, but thats usually orb weavers.)
They are not going to do the same amount of damage, as say, the pesticides/insecticides a farmer is using in his field - sadly pesticides/insecticides seem to kill more spiders than the specific pest problem)
I'd enjoy them - pop out in the early evening to view them, though you might see them at all times of the day.