<p></p>
<blockquote>
<p>Planet generation: will create incompatible pbf or fail.</p>
</blockquote>
<p>The length of a serialized object is coded as a variable length integer:<br>
<em>"Protocol Buffers use a variable-bit encoding for integers. An integer is encoded at 7 bits per byte, where the high bit indicates whether or not the next byte is to be read.…"</em><br>
<a href="https://wiki.openstreetmap.org/wiki/PBF_Format#Low_level_encoding" rel="nofollow">Source</a></p>
<p>So the size of a key or a value is "unlimited" in practice.</p>

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