Depends on sections and departments.

Some can be hectic, some can be relaxing. So, apply wisely.

Conference call can be quite frequent or can be once in a while. Again it depends on the company, sections, depts.

If you are serving the US, then your conference calls are definitely late at night.

Best if you are serving the Japanese, can meet Japanese amoi. Time also matching, no need to attend late night conference call.