Interesting to see you also seem to be using this hack with TransactionSearch to retrieve e.g. a day's worth of records. If you do, be warned though - that method has substantial jitter, giving you slightly different results over time.
@Thorsten Behrens, I use TransactionSearch over 3 month window that moves forward by one week once per week. I've never experienced the "Jitter" you mention; eventually, all transactions show up. (The Ledger file I import to keeps track of which transactions have been seen before).