real users: what age has enjoyed using this independently?

I have used it with 7 and 8 year old children and they are able to use it independently.

How long would you say it takes to follow the instructions and assemble one of the machines? Our science classes are 30 min long. Thanks.

Because different people complete things at different speeds, there isn't one definitive answer. But, depending on the difficulty level of the model (they get more challenging as you progress through the manual), they can take anywhere from 15 minutes about 30 minutes, on average.

Good Morning!! Thank you for asking about the price of this item. Currently all the items we have listed on Amazon are at the absolute lowest price we can offer. Thank you and have a great Monday! HobbyTown Customer Service

Product Dimensions	22.1 x 6.35 x 27.94 cm; 498.95 g
Manufacturer recommended age	8 - 15 years
Item model number	665069
Educational Objective(s)	Understand gear operation and the six classic simple machines
Number of Puzzle Pieces	132
Assembly Required	Yes
Scale	1/32
Batteries Required?	No
Batteries Included?	No
tech_spec_battery_description_toys	No batteries required
Material Type(s)	Plastic
Remote Control Type	Not Available
Release date	1 May 2019
ASIN	B07PCKTP3K

Simple Machines Science Experiment & Model Building Kit, Introduction to Mechanical Physics, Build 26 Models to Investigate The 6 Classic Simple Machines

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