Context :

Aims : Within the framework of the COSMOGRAIL collaboration we present 7- and 8.5-year-long light curves and time-delay estimates for two gravitationally lensed quasars : SDSS J1206+4332 and HS 2209+1914 .

Methods : We monitored these doubly lensed quasars in the R-band using four telescopes : the Mercator , Maidanak , Himalayan Chandra , and Euler Telescopes , together spanning a period of 7 to 8.5 observing seasons from mid-2004 to mid-2011 .
The photometry of the quasar images was obtained through simultaneous deconvolution of these data .
The time delays were determined from these resulting light curves using four very different techniques : a dispersion method , a spline fit , a regression difference technique , and a numerical model fit .
This minimizes the bias that might be introduced by the use of a single method .

Results : The time delay for SDSS J1206+4332 is \Delta t _ { AB } = 111.3 \pm 3 days with A leading B , confirming a previously published result within the error bars .
For HS 2209+1914 we present a new time delay of \Delta t _ { BA } = 20.0 \pm 5 days with B leading A .

Conclusions : The combination of data from up to four telescopes have led to well-sampled and nearly 9-season-long light curves , which were necessary to obtain these results , especially for the compact doubly lensed quasar HS 2209+1914 .