let monitor = await Service.monitor(session,taskId);
let percent = JSON.parse(monitor).result[0].data.percent;

let tryCount = 0;
let tryMax = 10;
while (percent < 100 || tryCount < tryMax) {
    setTimeout(function() {
        let percent = JSON.parse(monitor).result[0].data.percent;
        tryCount++;
    }, 5000);

    console.log('in a while loop ',tryCount, percent);

    if(tryCount == 10){
        var err = new Error('Error')
        throw err
    }
}

in a while loop  0 0
in a while loop  0 0
...
in a while loop  0 0
in a while loop  0 0