How important is the timing to Financial System Implementation?

Generally financial systems implementation projects are time overrun due to poor planning, lack of interest by the top management, change resistance from end users, delay in understanding the business processes flow by the consultants, finding solution to bridge the GAP highlighted by the GAP analysis and turnover of staff during implementation etc.

Timing is very important factors, the longer period the new system will take in implementation the management and key users will start losing interest in the new system.