Two weeks but I would say give or take two weeks.
It depends on what and from where you count. I say first signs are on June 29 ( for the sharp eyed).
Someone started in earnest on July 15 (obvious action started ).
Ended? by drill results released August 5.

June 29,2009:
"At Eagle One, hole NOT-09-049, drilled subvertically below known
mineralization, intersected two zones of disseminated, semi-massive
and massive sulphides, one from 269.54 metres to 510.69 metres and
the other from 749.7 metres to 945.67 metres; more than tripling the
known down dip extent of the mineralization to greater than
900 metres;"

July15,2009:
"TORONTO, Jul 15, 2009 (Canada NewsWire via COMTEX) -- Noront Resources Ltd. ("Noront" or the "Company") (NOT) announced today that there are no corporate developments or undisclosed material changes involving the Corporation to account for its recent rise in stock price."

Noront July,2009 stock prices:
Date Open High Low Close Volume
31-Jul-09 2.09 2.65 2.06 2.51 4,749,000
30-Jul-09 2.00 2.16 1.93 2.08 5,332,800
29-Jul-09 1.90 2.12 1.79 1.98 8,603,900
28-Jul-09 1.61 1.90 1.56 1.87 6,915,000
27-Jul-09 1.51 1.60 1.45 1.60 2,579,700
24-Jul-09 1.37 1.49 1.36 1.47 1,246,700
23-Jul-09 1.51 1.51 1.38 1.40 1,366,300
22-Jul-09 1.28 1.56 1.27 1.47 4,833,800
21-Jul-09 1.47 1.68 1.34 1.37 8,094,700
20-Jul-09 1.30 1.54 1.25 1.50 4,206,600
17-Jul-09 1.49 1.49 1.17 1.27 11,642,400
16-Jul-09 0.97 1.53 0.87 1.42 20,007,900
15-Jul-09 0.64 1.09 0.64 0.99 15,267,900
14-Jul-09 0.61 0.64 0.60 0.63 376,800
13-Jul-09 0.62 0.63 0.59 0.61 497,400
10-Jul-09 0.62 0.63 0.59 0.62 662,100

August 5,2009 drill results:
"HIGHLIGHTS:
Hole NOT-09-49 intersected two lenses of mixed disseminated to massive sulphides under the current Eagle One Deposit, now referred to as Eagle 1A:
Eagle 1B (the first lens) located vertically under Eagle 1A returned;
- 178.8 metres averaging 1.2% Ni, 0.5% Cu, 0.9 g/tonne Pt, 2.0 g/tonne Pd from 306.7 meters to 485.5 meters including;
- 2.0 metres averaging 2.5% Ni, 2.0% Cu, 0.4 g/tonne Pt, 4.7 g/tonne Pd
- 4.7 metres averaging 5.3% Ni, 1.3% Cu, 0.6 g/tonne Pt, 5.3 g/tonne Pd
Eagle 1C (the second lens) also located vertically under Eagle 1A and directly under Eagle 1B returned;
- 149.5 metres averaging 2.4% Ni, 1.1% Cu, 1.0 g/tonne Pt, 5.1 g/tonne Pd from 796.2 metres to 945.7 metres including;
- 23.7 metres averaging 5.2% Ni, 1.0% Cu, 0.2 g/tonne Pt, 7.9 g/tonne Pd
- 21.0 metres averaging 2.5% Ni, 1.0% Cu, 0.4 g/tonne Pt, 5.3 g/tonne Pd"