how long does it take to grow TG1 E. coli strain on M9 minimal plates? I streaked them yesterday and no colony showed up after overnight incubation at 37 °C. Do I have to wait longer times?

Yes, it does take longer for cells to come up - you may have to wait about 30-40 h before it even comes close to a LB after o/n incubation. M9 minimal is as per Sambrook - however, a net search reveals many other recipes (don't know about TG1). Remember that the glucose/other carbon source has to be autoclaved separately from the salts, in a different time/temp combination. Supplements are usually not required, but one tip is to add ~10% of a sterile tissue culture medium such as DMEM without any additives to your autoclaved medium.