meaning of "term extension"

[Jctgf]

hi,
when talking about renting an apartment, there are short term contracts and long term ones.
what is the name of this property that the "term" has? extension? duration? length?
if i want to write down a reminder to myself, could I write it as follows?
"do not forget to ask about the term extension".
thanks.

[Mister Micawber]

.
I would just use 'length'. 'Extension' is inappropriate, since it suggests a change in an earlier term.
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Native English teacher at Mister Micawber's