#include<bits/stdc++.h>
using namespace std;
#define int long long int
 
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int tt;
    cin >> tt;
    while (tt--) {
        int n, mn = INT_MAX;
        cin >> n;
        vector<int> a(n + 1);
        for (int i = 1; i <= n; i++) {
            cin >> a[i];
            mn = min(mn, a[i]);
        }
        map<int, int> mp;
        int s = 0, mxLen = 0;
        for (int i = 1; i <= n; i++) {
            s += a[i];
            if (s == mn) {
                mxLen = i;
            }
            if (mp.find(s) == mp.end()) mp[s] = i;
            if (mp.find(s - mn) != mp.end()) mxLen = max(mxLen, i - mp[s - mn]);
        }
        cout << mxLen << '\n';
    }
    return 0;
}