We have developed our own solution for Redmine to Drupal data sync:
https://www.drupal.org/project/redmine_sync
Exposes Redmine time entries to Views and allows to relate them to Drupal nodes and users.
Supports automatic and one-time users mapping between Redmine and Drupal (based on email).
NOTE: this module requires read-only connection to Redmine's DB - this has proven to be much more faster as opposed to sync using Redmine's REST API, also, using direct DB access makes integration easier.
This module was built specifically to support Redmine time entries - there is no Views integration with other Redmine entities (Issue, Project, etc), Time Log and users only.
Feedback appreciated. Feel free to use modules issues queue for feature requests/bug reports.