Yes, 1.5 - 2 hours would be reasonable. There's more in Tomar though; for instance the oldest Portuguese synagogue (15th century) tomarportugal.com/attractions/synagogue-tomar
2 hours would be more reasonable, othervise you will be rushing through it and not really stopping to absorb the atmosphere of this place which it absolutely deserves.
hi,if it's just the convento de cristo you want to see then i found 2 hours was more than enough time but as post one mentioned there's a lot more to tomar.this probably won't mean much to you coming from montreal but i waited nearly 50 years to see my first red squirrel in a park in tomar.enjoy tomar you won't be dissapointed.
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