I am reading a midi file with this parser. But I cannot read the real time.

MidiFile midiFile = new MidiFile("/Jenkins.mid");
var ticksPerQuarterNote = _midiFile.TicksPerQuarterNote;
foreach (MidiTrack track in midiFile.Tracks)
{
    foreach (MidiEvent midiEvent in track.MidiEvents)
    {
        if (midiEvent.MidiEventType != MidiEventType.NoteOn)
           continue;
        int note = midiEvent.Note;
        int time = midiEvent.Time;
    }
}

All the formulas I have seen on the internet use the tempo, but I can't find it.