Additive manufacturing is a growing transformative technique for industrial fabrication of lighter and stronger components, which is also called as 3D printing. The Fused Deposition Modeling (FDM) based additive manufacturing processes is employed for manufacturing of polymer components for different applications. Printing time commonly known as build time is an important aspect of FDM based 3D printing. In current investigation rectangular blocks are printed in FDM with 13 different infill patterns. The analysis is made on the basis of time taken by different infill patterns for different shapes. Here total build time is further broken into retraction, outer wall printing, inner wall printing, skin printing, infill printing, and heating. It is observed from analysis that while printing rectangular shape, the printing time is increased by 37.50%, 29.17%, and 33.3% for Cross, Cross3D, and Gyroid infill patterns respectively as compared to least time for printing the Zig-Zag, Grid, and Cubic Subdivision patterns. It can be observed that for Cross, Cross3D, and Gyroid patterns, time taken by nozzle to complete the infill is almost 1.5–2 times more than that of all the remaining patterns.