The phrase "allowance of two" is correct and usable in written English.
It can be used in contexts where you are referring to a permitted quantity or limit, specifically indicating the number two.
Example: "The allowance of two items per person ensures that everyone has a fair chance to participate."
Alternatives: "limit of two" or "quota of two".
At Verizon, the cost of the same iPhone was $200, but a similar monthly plan — with a data allowance of two gigabytes — was $100 a month, bringing the cost up to $2,600 for two years.
The new program might still be called Medicare — hey, we could replace government coverage of major expenses with an allowance of two free aspirins a day, and still call it "Medicare" — but it wouldn't be the same program.
Briefly, trypsin was fixed as the protease with a maximum allowance of two missed cleavages.
The parameters used were: allowance of two tryptic miss cleavages, peptide error tolerance of ±0.6 Da, MS/MS error tolerance of ±0.2 Da, peptide charge +1 and variable modifications of methionine (oxidation), cysteine (carbamidomethylation and propionamidation).
For RNA-seq analysis, the 100-bp paired-end sequencing reads were mapped to the reference genome using TopHat 2.0.6 (Trapnell et al. 2009), with allowance of two mismatches in read mapping to the reference genome.
The parameters for data search included (1) variable modifications allowing mass difference of 80 Da for possible phophorylation and 6, or 10 Da for C6-Arg, or C6, N4-Arg, respectively, (2) tryptic peptides with allowance of two missed cleavages, and (3) top hit(s) with individual cross-correlation over the threshold dependent on precursor charge states.
There is a maximum allowance of one Walter Mitty per household, that's just how it goes.
Planes flying internationally also have a more flexible allowance of four hours.
To impress him further with the value of money, he gave the boy a weekly allowance of five cents, in pennies, payable on presentation of a budget allocating every cent of it.
The media and the fans are going to be after us.' " The allowance of five foreign players per club team in Mexico's domestic league has stifled the development of young players, officials said.
Flanner suggests that it was Poe's dilatoriness both in funding the publication of Stein's unpublished work and in sending Toklas her monthly personal allowance of four hundred dollars that drove her to the rash act that precipitated the seizure of the paintings.
