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There's no magic formula. Generally Ha is brightest but the amount of OIII and SII varies hugely depending on the object. You'll normally need to do longer subs and/or more of them in OIII and SII to get SNR even vaguely approaching that of your Ha.
I use constant length subs, typically 30 mins, and use the PI noise analysis tools as a guide to figure out the number of subs I need in each filter.
Cheers,
Rick.
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