MISHNA BERURAH YOMI MISHNA BERURAH DIRSHU JULY 5

INTRODUCTION When one sees and hears lightning and thunder he makes 2 brachas on the lightning he makes an ose mase berashis and on the thunder he makes a shekoco vgvuraso mla olam
S"A 227 Mishna Berurah sif katan 8
but the sky remained cloudy then his obligation to make a blessing for all the lightning or all the thunder continues to be discharged by means of the 1st blessing and he does not need to make a new blessing

Mishna Berurah Dirshu chelek 2
Q:How long is a day to not need to make a new bracha

A:Rav Shlomo Zalman Aurbach and Rav Wosner say if you go to sleep and then get up it is considered a new day for a bracha