I think it will hold well in most markets, seems to be having good weekdays grosses all around.
(I know some numbers have been posted already) From Screen Daily:
"Christopher Nolan’s sci-fi epic stands at $121.1m overall and established a new record for the director in China.
The film added $16.2m overall on November 12, led by a $2.3m haul in South Korea to reach $20.1m, $1.6m in the UK for $12.4m and $898,000 in Russia for $11.6m.
Spain generated $537,000 for $3.7m, Italy $475,000 for $4.9m, Germany $455,000 for $6m, Australia $403,000 for $5m, France $376,000 for $9.1m, Mexico $325,000 for $4m and Brazil $195,000 for $2.4m."
http://www.screendaily.com/box-office/interstellar-scores-record-china-opening-for-nolan/5080015.article?referrer=RSS