n> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">end</span><span class="o">.</span><span class="n">strftime</span><span class="p">(</span><span class="n">TIME_FORMAT</span><span class="p">)</span>
        <span class="k">return</span> <span class="p">(</span>
            <span class="sa">f</span><span class="s1">&#39;(</span><span class="si">{</span><span class="n">start_time</span><span class="si">}</span><span class="s1">, </span><span class="si">{</span><spa