Merging contiguous tracks

I often have several large tracks (eg 3 x 3 hours). I want these in one track so I use align tracks end to end & then mix & render. The mix & render takes a long time although only one track at a time has any sound. Is it possible to recognise mix & render to silence & speed the process?

Rather than mixing the tracks, you could simply drag the clips into the same track, or even keep them in separate tracks (the tracks will automatically be mixed to a single file when you export).

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Unfortunately the mixing on export takes a long time even though only one track has any content at any point, hence the mix first.