{%- assign nbr_days = site.data.program.days | size -%} {%- if nbr_days > 1 and day_abbr -%}
{%- assign time_pronoun = site.data.lang[site.conference.lang].pronoun.on_ | default: "on" -%}
{%- else -%}
{%- assign time_pronoun = site.data.lang[site.conference.lang].pronoun.at | default: "at" -%}
{%- endif -%}