When performing oplog replay with mongorestore we have an oplog limit option, but we don't have an oplog from.

Similarly when dumping the oplog with the --oplog option for mongodump, there is no way to specify a from time.

If you have a mongodump backup from say 12:30 UTC and an Oplog dump that goes back several hours before that, it could potentially reduce the work this has to do by either dumping a smaller amount of Oplog or having to replay less of this when using mongorestore.