How far back do you allow prior period changes to be processed through T&L?

We recently had a union settlement where they wanted the employee made "whole" and to have time processed through T&L to Payroll for online check.  This request had time to be entered and process from 12/30/2017 through to 12/31/2019.  We ran into an array issue when trying to create the online check.  Our technical support advised that this array had a limit of 250 lines of TL data.  This retroactive time entry and processing had 900 lines of time to process.  We didn't feel comfortable increasing the array even temporarily for this, so ended up loading the data to paylines