Learn Italian: Con questo macchinario, analizziamo l'urina in poche ore. - With this machine, we analyze the urine in a few hours.

We use in to express the amount of time required to complete an action. It means the analysis itself takes a few hours. If you used tra or fra, the sentence would mean the analysis begins a few hours from now.

Why use macchinario instead of macchina?

While macchina means machine (and very often car), macchinario refers to complex machinery, industrial equipment, or medical apparatus. It sounds much more natural here for specialized lab equipment.

Why is poco written as poche here?

Here, the word for few is acting as an adjective modifying ore (hours). Since ora is a feminine noun, its plural ore requires the feminine plural adjective poche.

Does analizziamo refer to an action happening right now or a general rule?

In this context, the present tense analizziamo expresses a general fact or capability of the machine (we analyze). The Italian present tense is very versatile and frequently used to describe how things generally work, not just what is happening at this exact second.