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When doing homework, it can be time-consuming to check the answers in a redox reaction due to different order of the reactants and products.

For example, while $$\ce{2MnO4- + 5Fe^2+ + 16H+ -> 2Mn^2+ + 5Fe^3+ + 8H2O}$$ and $$\ce{5Fe^2+ + 16H+ + 2MnO4- -> 5Fe^3+ + 8H2O + 2Mn^2+ }$$ are equivalent, they are not visually equivalent and to mark them as correct/incorrect takes a lot of time.

Is there a convention of what order to write these reactants/products in? If so, what is this convention?

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There is no convention.

There might be some cases where one choice simply makes more sense to people. For example I have yet to see anybody write

$$\ce{NaCl(s) <=>[H2O] Cl-(aq) + Na+(aq)},$$

but there is no convention dictating that you have to write $\ce{Na+}$ before $\ce{Cl-}$.

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