#include <iostream>
#include <vector>

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int t;
    std::cin >> t;
    while (t --> 0) {
        int n;
        std::cin >> n;
        std::vector<int> p(n);
        for (auto &e : p) {
            std::cin >> e;
            --e;
        }
        std::vector<int> q(n);
        for (int i = 0; i < n; ++i) {
            q[p[i]] = i;
        }
        int block_num = 1;
        std::vector<int> x(n, 1);
        auto update = [&](int i, int v) {
            block_num -= i > 0     and x[i - 1] != x[i];
            block_num -= i + 1 < n and x[i + 1] != x[i];
            x[i] = v;
            block_num += i > 0     and x[i - 1] != x[i];
            block_num += i + 1 < n and x[i + 1] != x[i];
        };

        int ans = 0;
        for (int i : q) {
            update(i, -1);
            int len = block_num;
            len -= i > 0     and x[i - 1] == 1;
            len -= i + 1 < n and x[i + 1] == 1;
            ans = std::max(ans, len);
            update(i, 0);
        }
        std::cout << ans << '\n';
    }
    return 0;
}