From case:
"If I use a Timer for a SLSB and persist it, all work correct if I start it.

The getNextTimeOut() give the correct time, the getRemaining() will show a value between 4990 and 4999 (intervall was 5000)

after a restart of the server the NextTimeout is in the past and the remaining is negative.
Looks like that the service continue with the old time."

So, getRemaining() returns a negative value after a server restart.