The phrase "approximately two days before" is correct and usable in written English.
You can use it when indicating a time frame that is not exact, typically in relation to an event or deadline.
Example: "The report was submitted approximately two days before the deadline."
Alternatives: "about two days prior" or "roughly two days earlier".
At the present time there is a latency of approximately two days before the Datacite search engine index incorporates any updates.
I cannot share the numbers of users that have upgraded but Phantom firmware v3.10 had only been online for approximately two days before we took it down, so the proportion of Phantom users that already upgraded is small.
Fifteen patients were within the window of bowel preparation (approximately two days before the surgery date) for surgery.
To understand the adipose transformation in more detail, we performed a global gene expression analysis with 7 time points ranging from approximately two days before birth to two weeks after birth.
Warner Bros. released the trailer online on April 30 , 2012 approximately four days before they attached it to theatrical prints of The Avengers.
Approximately four days before the theatrical release of the film, a workprint version of Halloween appeared online and was circulated around various BitTorrent sites.
Every four days (approximately four days before the peak of infection was reached) virus was harvested and a new batch of cells were infected.
Oc90 is expressed at E9.5 in the mouse otocyst, approximately five days before the onset of otoconial mineralization, and provides organic matrix scaffolding for calcium carbonate deposition.
Each of 176 flocks was visited approximately three days before the flock was depopulated for slaughter and at least 250 birds from each flock were gait-scored from ten, pre-selected, randomised sites within a house.
Adverse effects related to radioiodine administration, graded according to the National Cancer Institute Common Toxicity Criteria version 2.0, were recorded by the study participants on structured forms approximately four days before 131I administration, and four to seven days, two to three weeks, and three months following treatment.
Approximately seven days before the recordings, hoof trimming was accomplished.
