'days for which' is correct and usable in written English.
You can use it to refer to a specific period of time, for example: "The teacher is offering extra credit to any student who completes the assignments for the days for which she missed class."
An employee whose claim for benefits has been denied may continue to claim any additional day or days for which he or she believes that he or she is eligible for benefits.
All genotypes were imaged on the same day, during 7 days, for which three different differentiations were performed.
Peaks in the runoff time series were defined as days for which the preceding day and the following day both had smaller runoff values than the present day.
Different from Bhat and Gossen [2] and Bhat and Srinivasan [34] who analyzed the same data, they used the longitudinal data of the same respondents for both days for which data were available, rather than just one weekend day.
They talk of days for which they sit and wait All will be revealed.
The agency may establish a maximum number of days, up to 90 days, for which an exception may be approved.
Celebrating Thanksgiving, each man could undoubtedly point to developments from recent, tumultuous days for which he felt grateful.
She lost days of work because of the storm — days for which she will not be compensated.
Days for which satellites and riometers are connected by the same geomagnetic field line are selected using a geomagnetic field model.
Of note here, is the large proportion of days for which the peak UVI is less than 3, yet the daily dose is greater than 2.5 SED.
The performance dates through the year correspond to the Sundays and feast days for which each cantata was created, based on its own piece of liturgy.
