public CompletableFuture<Void> after(long intervalMillis) {
			return atSystemTime(mark + intervalMillis);
		}
Schedule a task to run when the given number of milliseconds has passed since this mark

<p>
The method returns immediately, giving a future result. The future completes "soon after"
the requested interval since the last mark passes. There is some minimal overhead, but
the scheduler endeavors to complete the future as close to the given time as possible.
The actual scheduled time will not precede the requested time.

@param intervalMillis the interval after which the returned future completes
@return a future that completes soon after the given interval
Ghidra/Framework/Generic/src/main/java/ghidra/async/AsyncTimer.java