#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define nl << "\n"
#define yes << "YES\n"
#define no << "NO\n"
#define sp " "
ll n, k;
const int N = 20000, K = 20000;
char a[N][K];
ll clk(ll x, ll y)
{
    ll val, mn = 0;
    ll left = 0, right = 0, up = 0, down = 0;

    for (int i = y - 1; i >= 0; i--)
    {

        if (a[x][i] == '+')
        {
            left++;
        }
        else
        {

            break;
        }
    }
    for (int i = y + 1; i < k; i++)
    {

        if (a[x][i] == '+')
        {
            right++;
        }
        else
        {
            break;
        }
    }
    for (int i = x - 1; i >= 0; i--)
    {

        if (a[i][y] == '+')
        {
            up++;
        }
        else
        {

            break;
        }
    }

    for (int i = x + 1; i < n; i++)
    {

        if (a[i][y] == '+')
        {
            down++;
        }
        else
        {

            break;
        }
    }

    val = min({left, right, up, down});

    return (4 * val) + 1;
    // else return 0;
}
void solve()
{

    cin >> n >> k;
    int c = 0;

    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < k; j++)
        {
            cin >> a[i][j];
            if (a[i][j] == '+')
                c++;
        }
    }

    ll mx = 0, cnt = 0;
    // clk(2,3);
    int i = 0, j = 0;
    while (i < n)

    {

        if (a[i][j] == '+')
        {
            mx = max(mx, clk(i, j));
        }
        if (j == k-1)
        {
            i++, j = 0;
        }
        else
            j++;
    }

    cout << mx nl;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL), cout.tie(NULL);
    ll t;
    cin >> t;
    for (ll i = 0; i < t; i++)
        solve();
    return 0;
}