Is there some maximum duration allowed between SAT-1, & SAT-2, My daughter got 1780 in SAT-1, should she try and improve this score in 2nd trial or straight away start preparing for SAT-2? She is now in 11th preparing for JEE too...

SAT is conducted 6 times a year i.e. October, November, December, January, May and June every year. There is no maximum time. If your daughter took the test in October, she can take it in November as well. Since the next date is May, she is eligible to take the test in May. Hope my answer has solved