The phrase "a two day orientation" is correct and usable in written English.
It can be used to describe an orientation program that lasts for two days.
Example: "The company will hold a two day orientation for all new employees starting next week."
Alternatives: "a two-day training" or "a two-day introduction".
The students enjoyed a three day orientation, which culminated in a wine and cheese reception on Friday, August 19th at Alumni House.
JEANNINE HAGADORN: So every year at Cornell during the orientation period there's a two day event called dump and run.
Highlighting this summer's research activities will be Orientation for new Tata Fellows at IIT Bombay – a five day crash course on India and its many challenges and opportunities.
The two day course in March 2012 consisted of orientation lectures with MR imaging; expert led, small group workshops handling cadaveric specimens; simultaneous access to real-time ultrasound on live models; and ultrasound practice on patients with pathological anatomy.
DESIGN: Twenty-seven incoming surgical interns participated in a two-day orientation to clinical duties.
Beloit College in Wisconsin admitted its first January group this year, nine students who gathered, and quickly bonded, at a four-day orientation at a nearby lake resort.
Twenty MassLIFT-AmeriCorps members started their year of service this September with a four-day orientation at the Harvard Forest.
Top management is often involved; at Morgan Stanley's Return to Work Program, senior leaders discuss the firm's strategy and culture in a two-day orientation.
Barack Obama's strategist David Axelrod arrives in London on Tuesday for a two-day orientation with his new employers the Labour party, but if he picks up a newspaper at Heathrow he may well be tempted to wheel the baggage trolley round and head straight back through Customs to Chicago.
The U.S.-Asia Security Initiative at the Shorenstein Asia-Pacific ReseAPARCCenter (APARC) in the Freeman Spogli Institute (FSI) organized a group of faculty and fellows for a two-day orientation of United States Pacific Command (USPACOM) and its component military organizations in and around Honolulu, Hawaii, April 13-14, 2017.
Attend a 3-day orientation workshop.
