Attached is a new two-patch series implementing finer-grained control over the format of clocksum durations (only in overlays and the mode-line; the format of the CLOCK entries stored in org files remains unchanged and hard-coded, as before). The first patch: - defines a new org-minutes-to-clocksum-string function (replacing org-minutes-to-hh:mm-string) for formatting time durations according to customization options; - unifies the formatting of clocksum durations throughout org-colview.el and org-clock.el by always calling org-minutes-to-clocksum-string to do the formatting; - extends the org-time-clocksum-format defcustom, allowing it to either be a single format string (as before), or a list of between 1 and 3 format strings for the minutes, hours and days components of a time duration; - retains the org-time-clocksum-use-fractional and org-time-clocksum-fractional-format defcustoms, whose meaning is unchanged. The second patch: - further extends org-time-clocksum-format to allow separate month and year components (where a month is taken to be 30 days, a year to be 365 days). Both patches maintain backwards-compatibility with any existing customizations users may have made to these variables. They just add an additional type for org-time-clocksum-format. The reason for retaining separate org-time-clocksum-format and org-time-clocksum-fractional-format's is that (i) it doesn't make much sense to have a list of formats for separate components when using the fractional format (see Nicolas' examples earlier in this discussion thread); (ii) it maintains backwards-compatibility; (iii) it side-steps the issue of making users customize the format whenever they modify org-time-clocksum-use-fractional. I'm not wedded to new customization type I've used in org-time-clocksum-format. If you prefer a plist, or a different ordering of the format strings in the list, or a different customization ui, that's fine by me. Toby -- Dr T. S. Cubitt Mathematics and Quantum Information group Department of Mathematics Complutense University Madrid, Spain email: tsc25@cantab.net web: www.dr-qubit.org