Lawyer Lin Shanglun said professional legal AI is starting to challenge one of the legal industry’s core pricing structures: billing by the hour.
In an article published by BlockTempo, Lin wrote that a complex litigation brief that once required 30 to 60 hours of work can now be completed in 15 to 20 minutes after professional legal AI and a suitable workflow are introduced. He argued that this shift could eventually make the traditional billable-hour model obsolete.
From 30 to 60 hours down to 15 to 20 minutes
Lin said legal services have long been among the most expensive forms of knowledge work. From large law firms in Taiwan to top firms in the U.K. and the U.S., he wrote, hourly legal fees can range from $200 to more than $2,000.
He said a full civil complaint, statement of defense, or review of a major commercial contract used to require several employed lawyers working alongside a partner, with total labor time often reaching 30 to 60 hours. In the pre-AI era, he said, fees running into hundreds of thousands or even more than a million were considered reasonable because that work reflected intense intellectual labor built on long nights spent examining files and statutes line by line.
That production process, in his telling, has now been overturned by advanced AI tools. With the right workflow and specialized legal AI, Lin said, a complex litigation filing that previously took 50 or 60 hours can now be compressed to less than 15 to 20 minutes.
General-purpose GPT is not the same as legal production AI
Lin addressed skepticism from lawyers who say AI-generated legal filings are chaotic or filled with invented legal citations. He wrote that many of those judgments come from using ChatGPT or other general chat models through a web interface and then treating that experience as proof that AI is unreliable for legal work.
He said that is a category mistake. In his view, people are using a consumer-grade chat tool to judge a professional-grade production system. The base models available to ordinary users online, he wrote, do not have dedicated legal reasoning logic and are not connected to real-time judicial practice materials, so hallucinations and irrelevant arguments are likely when they are asked to handle complicated legal disputes.
By contrast, Lin said professional legal AI systems usually rely on retrieval-augmented structures, including MCP or API integrations, to pull real court rulings and statutory databases in real time. Those systems then generate arguments according to the issue structure used in litigation practice and the formal format required for legal pleadings.
He also said the skill barrier has dropped. Earlier AI tools may have required strong prompt-engineering ability, but current products have made that less important. According to Lin, even a user with no legal background can use a professional legal AI tool, enter the factual details of a case and supporting evidence through a clear process, and receive an automatically generated filing within 20 to 30 minutes. He said the result can include precise claims, complete statutory elements, and real case citations supporting each assertion, with accuracy comparable to that of a senior lawyer with years of practical experience.
Comparing hundreds of thousands of rulings in seconds
Lin said the core of litigation is a highly structured process of logical reasoning. For that reason, he argued, AI’s logic in fact pattern application and rule application is not fundamentally different from the reasoning process of a strong human legal mind.
The major difference, he wrote, is memory. Even an experienced lawyer can only remember and retrieve a few hundred or a few thousand judicial views in real time. A professional legal AI system, by contrast, can compare hundreds of thousands of court rulings within seconds and identify what he described as the strongest litigation strategies and argument structures.
Lin said this is not a distant vision. He described it as an operational reality that is already playing out every day. When a case that once required several lawyers to work for a full week, or even several months, can now yield comparable legal output in under half an hour for a lay user, he said the profession’s reliance on hourly billing may not last.
Q&A in the article returns to pricing pressure
In the article’s Q&A section, Lin repeated that criticism of AI-written legal filings often comes from testing general chat models that lack legal reasoning frameworks and live access to judicial practice materials.
Asked how AI could reshape the billable-hour model, he said that work once handled by multiple lawyers over a week or even several months can now produce comparable results in less than 30 minutes when a layperson uses professional legal AI. On that basis, he said hourly billing in legal services may ultimately disappear.