Standard deadlines World Community Grid requires work sent to volunteers' computers to be returned within a set time limit. This is to ensure the overall project batches do not get delayed. At the same time this facilitates the participation of devices that are on only a few hours per day. E.g. home computers can process a project in the background whilst doing email, web browsing and other housekeeping chores. The principle is that every cycle counts and a work unit eventually does get completed. Frequent checkpoints will let these jobs resume very near to where they were shut down the previous time.