M30 time frame is the most appropriate to see what would happen
for the news due to the mostly news is announced at the
interval of 30 min. News located at
http://www.forexfactory.com
The larger the timeframe, the more useful of the indicator.
No one will chose different timeframe if there are no
indicators.
There is one weakness for the timeframe and indicators, which
is if a currency pair of higher spread more than 20 pips such
as GBP/CAD, GOLD, the smaller timeframe equipped with any
indicator surely not suitable at all, because you have to
project the next 40 pips in order to win risk (1:1) reward.
A higher time frame such H4, news does not really impact your
trade.
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You may close your trade :
M1 - within seconds / minutes
M15 - within hours
M30 - within hours
H1 - within hours
H4 - within hours / one day
D1 - a few days / a week
W1 - a week / few weeks
Being a day trader, they would probably at M1, M15, M30, H1 and H4.
Anything that above H1, news does not really impact on your trade.