A "time gig" refers to a job or activity that only requires a limited amount of time commitment or is done occasionally instead of being a full-time commitment. Full definition
In the meantime, we had to support ourselves, so he found a part time gig at the local humane society. (stubbydog.org)
From a full blown job to a part time gig in a local shop, anything that builds their character and sense of responsibility shows that they are making the first steps towards maturity. (thefashionablehousewife.com)