Well assuming you don't run Ultimate maps like I do, cause I rather run Advanced for better exp/stamina. You will get 1 cherry per 10 stamina used. Doing Advanced you will also get around 225 dolls per run. You need 5 runs, to get even 20 cherries, and with that get 1125 dolls. 20 cherries are 2 spawns of 0-stamina bonus stage with lets say 2 runs each. Thats 4x345 = 1380 dolls.

Thus per 200 stamina (5 advanced runs) you gain an average total of 2505 dolls. To fully clear both event phases you need 84K dolls. With a bit of rounding up we end up with a total of 6720 stamina needed to fully clear all resets of gacha. With "safe" 12 days to spare on event thats 560 stamina a day. There is 480 stamina passively regenerated each day and at minimum 9 gathers done for sake of dailies with average of 15 stamina per gather which is 135 more stamina a day - total 615 a day.

In conclusion even on safe calculations we actually have over 40 stamina a day to spare on other than event stuff and will still be able to fully clear each reset. Which means that if you skip on some stuff and get lucky on spinning out reset-enabling things fast, you can easily farm some Manyus/Dragons or reissue.

Now the question is, is it worth doing reissues to get doubles of girls you already have, or maybe just get blooms as a character specific Manyus, or ignore them completely to use time/stamina/resources on other girls I already have (20 un-evolved gold girls).