Minimum order expiration time?

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I discovered that there must be some lower limit to the expiration parameter of OrderSend; ie, the order can only expire more than X minutes from the current time or the OrderSend() fails. What is X (the number of minutes or seconds from the current time)?

The following code would work on a 15min chart, but not on a 5min chart:

datetime closetime = CurTime()+Period()*60*2;
OrderSend(Symbol(), OP_SELLLIMIT, Lots, entryprice, 0, 0, 0, NULL, 0, [b]closetime[/b], Red);
 
minimal expiration time is 600 seconds from current time
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