Saving timestamps

Sharing a screen shot where start time and duration is defined and a corresponding log file

6.4691 	EXP 	Created window1 = Window(allowGUI=False, allowStencil=False, autoLog=True, bitsMode=UNKNOWN, blendMode='avg', color=array([ 0.,  0.,  0.]), colorSpace='rgb', fullscr=UNKNOWN, gamma=None, lms=UNKNOWN, monitor=<psychopy.monitors.calibTools.Monitor object at 0x7f8d959c8a50>, multiSample=False, name='window1', numSamples=2, pos=[0, 0], screen=1, size=array([1920, 1080]), stereo=False, units='deg', useFBO=True, useRetina=False, viewOri=0.0, viewPos=None, viewScale=None, waitBlanking=True, winType='pyglet')
6.4692 	EXP 	window1: recordFrameIntervals = False
6.6343 	EXP 	window1: recordFrameIntervals = True
6.8182 	EXP 	window1: recordFrameIntervals = False
6.8791 	EXP 	Created grating = GratingStim(autoDraw=False, autoLog=True, color=array([ 1.,  1.,  1.]), colorSpace='rgb', contrast=1.0, depth=0.0, interpolate=True, mask=u'gauss', maskParams=None, name='grating', opacity=1.0, ori=1.0, phase=array([ 1.,  1.]), pos=array([ 0.5,  0.5]), rgbPedestal=array([ 0.,  0.,  0.]), sf=array([ 1.,  1.]), size=array([ 800.,  800.]), tex=u'sin', texRes=512, units='deg', win=Window(...))
6.8829 	EXP 	Imported Book1.xlsx as conditions, 8 conditions, 3 params
6.8832 	EXP 	Created sequence: random, trialTypes=8, nReps=5, seed=None
6.8834 	EXP 	New trial (rep=0, index=0): {u'tf': 1, u'sf': 0.080000000000000002, u'ori': 360}
6.8918 	EXP 	grating: sf = array([ 0.04,  0.  ])
7.4020 	EXP 	grating: autoDraw = True
9.3852 	EXP 	New trial (rep=0, index=1): {u'tf': 1, u'sf': 0.080000000000000002, u'ori': 180}
9.4009 	EXP 	grating: autoDraw = False
9.4009 	EXP 	grating: sf = array([ 0.04,  0.  ])
9.9176 	EXP 	grating: autoDraw = True
11.8851 	EXP 	New trial (rep=0, index=2): {u'tf': 11, u'sf': 0.080000000000000002, u'ori': 90}
11.9008 	EXP 	grating: autoDraw = False
11.9008 	EXP 	grating: sf = array([ 0.04,  0.  ])
12.4173 	EXP 	grating: autoDraw = True

Not sure how I can extract duration and shift from the log file here?