Sorry all, my bad... the link above doesn't lead to a process to log time spent on UX/UI development. I just created a process now http://nrp.sensorica.co/accounting/process/888/
I liked to it from the main wiki page on Github, so you can find it there if you lose the link https://github.com/Sensorica/valuenetwork/wiki
OR, you can find it in the NRP-VAS on the project page, here http://nrp.sensorica.co/accounting/agent/174/
see Active processes, but in order to get to it you need to remember that the process belongs to a project that is called "Infrastructure virtual"... which is not ideal.