Q: Auspicious time,period
A: I did a Yahoo search and found these links for you. Do take a look at them. the first link gives the Vidhi very well . It says: Siddhivinayaka pooja: prepare vinayaka by paste of turmeric powder and put kumkuma on it and start pooja with akshathas. Slokam: gururbrahmaa, gurur Vishnu. Gurur devo maheswaraha, guru sakshath parabrahma thasmisri guravey namaha Decorate the north east corner with water and turmeric powder and ragavallis with rice flour. put a plank on ragavlli decorate the plank and put astadalapadma take a plate with rice and put a pan leaf on the rice. The vinayaka prathima place on the leaf. Then perform puoja put the plate on the plank. Put Oil Light in the niruthi ( south west) light the lamp and also dhoop stics. for more see link.