If you're serious about getting better on your instrument, the heck with the neighbors! (Unless they call the cops...) But seriously, on some days - for me, at least - thirty minutes is hardly enough time to fully warm up, let alone divide it among different areas of practice. Realistically, it depends. For general development and improvement on the saxophone, long tones and scales are certainly more important. I'd say do some long tones, if for nothing more than to at least get your lip and reed working, and then run your scales and arpeggios. On the other hand, if you have a deadline (e.g., rehearsal, concert, etc.) rapidly approaching and you have music to learn, then it might be a better idea to just hit a few long tones, and then really aggressively start to look at the music.
In a perfect world, we would all have time to blow at least thirty minutes of long tones, and then run scales and arpeggios for about 2 hours, before even beginning to look at tunes/repertoire and/or improvisation, DAILY. Since this is not the case with the vast majority of us, we have to make do with what we do have, while still realizing the supreme importance of the fundamentals.
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EDIT: I did not include sight-reading in the line up, as I am a firm believer that it is just plain reading that makes for better sight-reading, not just always reading things that you've never seen before.
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In all honesty, I almost never feel that 30-minute practice sessions are truly productive. I usually find myself just spot-checking things during that time, rather than making any real progess. I'd say shoot for at least an hour.