Project Euler Forum

I found this old post in thread of problem 127. Is this still so?

hk 5 Sep 2006, 22:18
A special remark on the one minute rule:
Problems are developed and tested so that the one minute rule can be met using an interpreted language like Visual Basic and with some skills also using scripting languages like PHP. Compiled languages like Delphi and the C-family are by nature about ten times faster than VB. When using a compiled language this means that runtimes should in general not exceed 6 seconds.

https://projecteuler.net/action=redirect;post_id=4694
(Sorry for quoting from thread, but this is not any spoiler, I think.)

While the Project Euler problem development team tests each problem to make sure there is a solution for every problem that runs in less than a minute for interpreted languages, understand that the Project Euler problem development team is not representative of the average Joe Project Euler problem solver ... So even if a less than a minute solution exists, it may be almost impossible for the average Joe problem solver to come up with it ....