If issued an en-route clearance limit, you will be given holding instructions. If the pattern is charted, and they rarely are, you might be issued, Hold east as published. Most moving map displays such as the G1000 and GTN series do not show published holds, necessitating a chart, but ATC will issue full holding instructions if requested. The FAA frowns on unpublished holds, saying that only those holding patterns depicted on U.S. government or commercially produced charts which meet FAA requirements should be used. This is another reason why rolling your own at JIDUK, is a shaky idea.