In order to speed up any process in your city, you can ask clan allies for help. Each allied help accelerates the current process by 1% of the initial construction time. The amount of help requests available depends on your Capitol level. You can increase the amount of help available for particular processes with the help of special Academy researches as well as Premium: the Great Ruler title grants you 5 additional help requests for technology research and construction upgrades.

Each allied help grants your clan 100 help points. You can read more about the clan help and clan borders here.