It's a game that can take you 20h if you rush it ( and you'll most likely get a sad ending ) to 50h (if you take your time and don't dislike dongeon rpg that you explore times and times again to complete objectives.)
It's only text heavy if you want to know the world and the characters . it does have lot of text but you're not forced to read it . It is recommanded to read it to understand the endings properly.
I never got bothered by the timer , not even once ... ok maybe once in the final level but even then it was doable.. there is an upgrade to give you more time on the timer to have more leeway.
Thanks for your help, I've decided to go for it and placed my order. I'll post some impressions after I start playing it.