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#include <bits/stdc++.h>
using namespace std;
int main(){
int cases; scanf("%d",&cases);
while(cases--){
int n; scanf("%d",&n);
int res = 0,finalRes=0;
map<int,int> M;
int curPos = 0;
for(int i=0; i<n;i++){
int cap; scanf("%d",&cap);
if(M[cap]!=0 && M[cap]>curPos) {
res=i-M[cap];
curPos = M[cap];
}
res++;
finalRes=max(res,finalRes);
M[cap]=i+1;
}
printf("%d\n",finalRes);
}
return 0;
}
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