A few hours a day adds up pretty quickly. Though I can understand not wanting _two_ music streaming service subscriptions.
Google play music is simply extremely convenient considering how nicely it works with Google Assistant. Additionally, I have tens of thousands of my own music collection uploaded to GPM that I'm free to download whenever I want without restriction. Spotify lets you play music offline, but it's basically cached and still tied to your premium Spotify subscription.
That looks like a rather active use.
Multiplied by how many days per year? Seems significant to me.
All of the services that I know of that let you read texts remotely are also blocked at work. Basically anything that falls under the category of messaging or email.
Use one of your backup codes?
It's inconvenient, but if your in an environment that disallows phones or other portable electronics (like 2FA Fobs/USB sticks), it may be the only reasonable way.
This is why I really dislike forced two factor authentication. It might make sense in a lot of circumstances, but not for everyone.
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Edit: Although, if we're talking about Google Play Music, I'm a bit confused, since you can turn two factor off for Google accounts. If you feel you need two factor on your main Google account but not Google Play Music (seems reasonable!), make a separate account for Google Play Music.