/*
    Author    : MishkatIT
    Created   : Tuesday 10-12-2024 16:27:09
*/

#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
#include "algo/debug.h"
#else
#define debug(...) 42
#endif

using ll = long long;
using ld = long double;
const int mod = 1e9 + 7;
const int N = 2e5 + 10;
const int inf = 1e9;
const ll linf = 1e18;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int tc;
    cin >> tc;
    while (tc--) {
        int n, m;
        cin >> n >> m;
        int f = 0;
        vector<vector<char>> v(n, vector<char>(m));
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                cin >> v[i][j];
                f |= (v[i][j] == '+');
            }
        }
        vector<vector<pair<int, int>>> ans(n, vector<pair<int, int>>(m));
        for (int i = 0; i < n; i++) {
            int cnt = 0;
            for (int j = 0; j < m; j++) {
                if (v[i][j] == '+') {
                    ans[i][j].first = cnt;
                    cnt++;
                } else cnt = 0;
            }
            cnt = 0;
            for (int j = m - 1; j >= 0; j--) {
                if (v[i][j] == '+') {
                    ans[i][j].second = cnt;
                    cnt++;
                } else cnt = 0;
            }
        }
        vector<vector<pair<int, int>>> bns(n, vector<pair<int, int>>(m));
        for (int j = 0; j < m; j++) {
            int cnt = 0;
            for (int i = 0; i < n; i++) {
                if (v[i][j] == '+') {
                    bns[i][j].first = cnt;
                    cnt++;
                } else cnt = 0;
            }
            cnt = 0;
            for (int i = n - 1; i >= 0; i--) {
                if (v[i][j] == '+') {
                    bns[i][j].second = cnt;
                    cnt++;
                } else cnt = 0;
            }
        }
        int mx = 0;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                mx= max (mx, min({ans[i][j].first, ans[i][j].second, bns[i][j].first, bns[i][j].second}));
            }
        }
        cout << mx * 4 + f  << '\n';
    }
    return 0;
}