On Fri, 7 Mar 2025, 05:54 Nikl Kelbon via Std-Proposals, <
std-proposals_at_[hidden]> wrote:

> We not even have a way to make it without overflow in standard.
>

Use the maximum value of the correct duration, i.e nanoseconds::max().

You can create a magic variable for that if you want to, something like:

struct maxtimeout_t {
  template<class D = std::chrono::system_clo k::duration>
  operator D() const noexcept {
    return D::max();
  }
};
constinit maxtimeout_t maxtimeout{};

I don't think this needs to be in the standard.