Halakhah su Levitico 27:23

That is that He commanded us about field appraisals. And that is His saying, "If anyone consecrates any field that he holds [...] And if a field that is not of his holdings" (Leviticus 27:16-22). And likewise with a field of his holdings, "its appraisal shall be in accordance with its seed requirement" (Leviticus 27:16); and with a purchased field, "The priest shall compute for him the proportionate appraisal" (Leviticus 27:23). And the regulations of this commandment have already been explained in Tractate Arakhin. And one should not think that these four types of appraisals have a commonality, such that it would be necessary to count them as one commandment. Rather they are four commandments. Each one has a law that is separate from the law of the other. However what is common to them is [only] the name, appraisal; such that they share one name. And with [careful] observation, this is clear. (See Parashat Bechukotai; Mishneh Torah, Appraisals and Devoted Property 4.)

And that which they, may their memory be blessed, said (Arakhin 23a) that we ask about appraisals and values [in order to annul them] in the [same] way that we ask about other vows and consecrations. And they also said (Arakhin 24a) that if there were animals or slaves or jewels among the possessions of the appraiser and the traders say, "If he buys clothing of thirty dinar for this slave, he will increase his value by more than sixty"; or "If you wait on this animal for a month, its value will increase by double"; or "If they bring this jewel to place x, it will be worth much money" - we do not listen to them at all. Rather we sell everything in their place and in their time, as it is stated (Leviticus 27:23), "and he shall give the appraisal on that day, holy to the Lord." And the understanding came about this that this verse teaches about all consecrated things that we do not sustain them, we do not wait with them for the market day and we do not take them from one place to [another]. And this is the principle - that they only have their place and time alone. And what are these words speaking about? About movable items. But we proclaim [the intention to sell] lands sixty consecutive days - morning and evening - and afterwards, we sell them.