hacks-guide-minimal-mistakes-theme/_includes/read-time.html

{% if post.read_time %}
  {% assign words = post.content | strip_html | number_of_words %}
{% elsif page.read_time %}
  {% assign words = page.content | strip_html | number_of_words %}
{% endif %}

{% if words < 180 %}
  {{ site.data.ui-text[site.locale].less_than }} 1 {{ site.data.ui-text[site.locale].minute_read }}
{% elsif words < 360 %}
  1 {{ site.data.ui-text[site.locale].minute_read }}
{% else %}
  {{ words | divided_by:site.words_per_minute }} {{ site.data.ui-text[site.locale].minutes_read }}
{% endif %}