The Grove-based squad drafted in Vowles from Mercedes last winter in a bid to turn around several disappointing seasons and make the most of opportunities offered by the new era of F1.
But his knowledge of the level of technology and sophistication that top teams operate at has exposed just how far behind Williams is right now.
Williams' head of vehicle performance Dave Robson said Vowles has put a clear plan in place to help the team recover, but the timescales involved are probably longer than originally anticipated.
"I'm completely confident in what he is doing," said Robson. "The timescales involved in actually seeing the real progress, it may take us beyond '24, perhaps.
"There's quite a lot of rebuilding and restructuring, and getting his experience of what state-of-the-art genuinely looks like has been quite enlightening.
"But it does mean there's a lot to do and probably more to do than we thought there was. So, there's a lot to do but he's set in motion all of the right things, but there's a gestation period to all of that."
Williams has enjoyed a step forward in performance this year and has been in the battle for points, but its current FW45 still lacks downforce compared to many of its rivals.
That competitive situation has left the team knowing that it needs to bring improvements to its current package, even though a lot of focus is being made on a much bigger step forward for 2024.
Source: Autosport