Can I calculate the bufferSize on .installTap to equal X seconds

Below is a quick snippet of where I record audio. I would like to get a sampling of the background audio so that later I can filter out background noise. I figure 10 to 15 seconds should be a good amount of time.

Although I am assuming that it can change depending on the iOS device, the format returned from .inputFormat is :

<AVAudioFormat 0x600003e8d9a0: 1 ch, 48000 Hz, Float32>

Based on the format info, is it possible to make bufferSize for .installTap be just the write size for whatever time I wish to record for?

I realize I can create a timer for 10 seconds, stop recording, paster the files I have together, etc. etc. But if I can avoid all that extra coding it would be nice.

    let node = audioEngine.inputNode
    let recordingFormat = node.inputFormat(forBus: 0)
    makeFile(format: recordingFormat)
    
    node.installTap(onBus: 0, bufferSize: 8192, format: recordingFormat, block: {
        [self]
        (buffer, _) in
        
        audioMetering(buffer: buffer)
        print ("\(self.averagePowerForChannel0)   \(self.averagePowerForChannel1)")
        if self.averagePowerForChannel0 < -50 && self.averagePowerForChannel1 < -50 {
            ...
        } else {
            ...
        }
        
        do {
            ... write audio file
        } catch {return};})
    
    audioEngine.prepare()
    do {
        try audioEngine.start()
    } catch let error {
        print ("oh catch \(error)")
    }