Changing Default Unit from 'Minutes' to Other Units
In the "Log Work Dialog" default unit of effort duration is minutes if you haven't changed it. This setting is read from JIRA itself and you can change it from JIRA's own administration pages. Please refer to "Configuring time tracking settings" for more details.
When time spent is specified with 'hour' unit as decimal number, 'Durations must be in whole minutes' error might be encountered. This is due to the value entered in the time spent part (eg 4.1h) being converted to other unit values when the default unit is 'minute' in jira's own time tracking settings. To avoid this problem and to be able to specify time spent in this way, the unit default setting on jira's time tracking settings should be changed to 'hour'.