Lag
Lag is a waiting time added to a dependency: the successor waits that many days after the link would otherwise allow it to start or finish. It models time that passes without work, such as concrete curing or a supplier's lead time.
Lag is written after the link type with a plus sign: 2FS+3 means start three days after task 2 finishes. It can be added to any of the four types.
Lag is not a task, so it uses no resources and has no owner. When the wait is real work someone has to do, model it as a task instead, so it can be tracked.
Worked example
| Task | Duration | Depends on | Scheduled | Total float |
|---|---|---|---|---|
| 1. Pour concrete | 2 days | None | Days 1 to 2 | 0 days |
| 2. Strip formwork | 1 day | 1FS+3 | Day 6 | 0 days |
Pour concrete finishes on day 2. With 3 days of curing lag, Strip formwork starts on day 6, not day 3.
Open this example in the free delay simulator to change the durations, the links or the delay and watch the schedule move.