Intraday trading on last hour means market must make its maximum move in last hour, otherwise it is not possible to make money. I have not seen market making its maximum move in the last one hour on everyday basis.
Swing trading entry on last hour is possible because a person can analyze price, volume, ta, news, etc. etc. but on next day trade should not go against the position taken otherwise making money is difficult.
In this forum, there are thousands of charts with time, these charts will give you some idea!
Professionals always do not stick to particular time for trading, instead they stick to timing the entry at right place which they analyzed earlier!