If you don't want to go to the bother of dipping individual pretzels use the broken ones in the bottom of the packet to make pretzel clusters. This is much easier and less time consuming but doesn't look as arty as a full pretzel.
I only dip for an occasion for others. For us mostly it's clusters.
My preference for chocolate is half dark and half milk chocolate.
There is no set amount of chocolate as it all depends on how many pretzels you wish to coat.
Why a few days, mostly they don't last that long but I think the pretzels go a little soft in the fridge after while.