A State solicitor said the file into the abduction and false imprisonment of Quinn Industrial Holdings director Kevin Lunney is so big that it is half his height.
Rory Hayden, the State solicitor for Cavan, said the book of evidence was sent to the DPP on Friday, January 31.
Mr Hayden said the file was the biggest he had seen in 25 years and that while he spent all week reading it, he still had not gone through all of it.
Mr Hayden told Judge James Faughnan at Harristown District Court in Roscommon he was confident that direction would be forthcoming from the DPP in "the near future".
"I can confirm that the file is with the DPP. It is a complex investigation, the file is half my height, it's up to my waist," said Mr Hayden.
Three of the four men charged with the abduction and false imprisonment of Mr Lunney appeared before Harristown District Court yesterday.
Darren Redmond (25), from Caledon Road, East Wall, Dublin, and Alan O'Brien (38) of Shelmalier Road, East Wall, were remanded in custody for two weeks.
A third defendant, who can't be identified for legal reasons, was also remanded in custody for two weeks.
All three will appear before the same court on February 21.
A fourth defendant, Luke O'Reilly (66) from Mullahoran Lower, Kilcogy, Co Cavan, was remanded in custody at a previous sitting to February 14.
Legal representatives for the men urged the case be moved forward but Judge Faughnan said some cases were more complex.