There are a couple of options when it comes to expansion joints in gutters.
Seamless gutter expansion joints.
Thermal expansion is the tendency for a material to expand and contract when exposed to changes in temperature.
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For runs that require longer than 50ft an expansion joint can be used or two shorter runs of gutter with end caps can be butted together with a piece of aluminum folded over the joint.
Expansion joints are a component in seamless rain gutter systems designed to protect the gutters from the effects of thermal expansion.
In addition these joints will minimize stress on mitered joints.
Expansion joints should always be installed on any gutter that extends more than 40 feet.
So if your gutters turn corners say on a hip roof you had better consider these wonderful devices.